The JCB‑38841 (56912) 216‑Piece Socket & Bit Set is a comprehensive and versatile toolkit designed for professional mechanics, workshops, and serious DIYers. It covers a wide range of socket sizes and bit types across the three most common drive systems (1/4″, 3/8″, 1/2″), making it suitable for general mechanical, automotive, and maintenance tasks.
1/4″ Drive Section :
13 × Sockets: 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13, 14 mm
7 × Deep Sockets: 4, 5, 6, 7, 8, 9, 10 mm
5 × Torx Sockets: E4, E5, E6, E7, E8
2 × Extension Bars: 2″, 4″
1 × Sliding T-Bar
1 × Bit Holder
1 × Universal Joint
1 × 6″ Spinner Handle
1 × Quick Ratchet Handle
3/8″ Drive Section :
10 × Sockets: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 mm
6 × Torx Sockets: E10, E11, E12, E14, E16, E18
6 × Deep Sockets: 10, 11, 12, 13, 14, 15 mm
1 × Spark Plug Socket: 18 mm
1 × Bit Holder
1 × Universal Joint
1 × Extension Bar (5″)
1 × Quick Ratchet Handle
1/2″ Drive Section :
15 × Sockets: 10, 11, 12, 13, 14, 15, 17, 19, 20, 21, 22, 24, 27, 30, 32 mm
5 × Deep Sockets: 16, 17, 18, 19, 22 mm
3 × Torx Sockets: E20, E22, E24
2 × Extension Bars: 5″, 10″
1 × 3‑Way Adapter
1 × Universal Joint
1 × Bit Holder
2 × Spark Plug Sockets: 16 mm, 21 mm
1 × Quick Ratchet Handle
Other Items / Accessories :
2 × Bit Sockets: T55, T60
12 × Spanners / Wrenches: 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 22 mm
7 × Hex Key (Allen) Wrenches: 1.27, 1.5, 2, 2.5, 3, 4, 5 mm
30 × Bit Sockets: PH, PZ, FD, HEX, TORX, TT, M series
30 × Bits: HEX, SL, PH, PZ, TORX, TT, M series
44 × Bits: SL, PH, PZ, TORX, TT, HEX and others
1 × Screwdriver
1. Automotive / Vehicle Repair :
Removing / tightening bolts, nuts, spark plugs, body panels, engine components, interior fasteners
2. Motorcycle / Small Engine Repair :
Disassembling covers, engine casings, carburetor parts, fairings
3. Industrial / Maintenance / Plant Repair :
Servicing machinery, conveyor gearboxes, heavy equipment, assembly maintenance
4. Construction / Structural Work :
Bolt tightening in steel structures, frame assembly, installation of mechanical systems
5. Electrical / HVAC / Appliance Repair :
Opening panels, mounting units, securing brackets, fastener work in appliances
6. DIY / Home Workshop :
General maintenance, assembling furniture, home repairs, bicycle work
7. Fabrication / Metalworking :
Welding jigs, machinery setup, fixture bolts
8. Service / Field Engineers / Mobile Mechanics :
On‑site repair of vehicles or machines
User Instructions :
1. Choose the Right Drive Size
- ¼″ drive – for light-duty work (small screws, electronics, dashboards, bikes)
- ⅜″ drive – for general-purpose automotive and household work
- ½″ drive – for heavy-duty work (suspension, engine mounts, lug nuts)
TIP : Use the smallest suitable drive to avoid fatigue and allow easier access.
2. Select the Correct Socket or Bit
- Match the socket to the bolt or nut size (e.g., 10 mm, 17 mm, 24 mm)
- For screws, choose the correct bit :
- PH / PZ – for Phillips and Pozidriv
- SL – for flat screws
- Torx / Hex – for specialty fasteners
- Use the exact size to avoid rounding off fasteners.
3. Attach to the Ratchet Handle
- Push the socket or bit onto the correct ratchet drive (¼", ⅜", or ½")
- Ensure it clicks into place securely
You can also attach extensions, swivel joints, or adapters for better reach or angle.
4. Set the Ratchet Direction
Most ratchets have a switch to toggle:
- Tighten (clockwise)
- Loosen (counter-clockwise)
- Flip the switch on the back of the ratchet head to change direction.
5. Position and Operate
- Place the socket or bit fully onto the fastener
- Turn the ratchet handle in the required direction :
- Short back-and-forth strokes (thanks to 72-tooth mechanism)
- Ideal for working in tight spaces
Use steady force; don’t jerk or force the tool.
6. Use Accessories as Needed
- Extension bars : For recessed or hard-to-reach bolts
- Universal joints : To reach fasteners at odd angles
- Spark plug sockets : For vehicle spark plug removal/installation
- Adapters : Convert one drive size to another
7. After Use
- Wipe tools clean to remove grease/dirt
- Return each piece to the case for easy tracking
- Store in a dry place to prevent rust
Maintenance :
1. Clean After Every Use
- Wipe all sockets, bits, and ratchets with a clean dry cloth after use.
- For greasy or dirty tools:
- Use a mild degreaser or brake cleaner.
- Dry completely before storing.
Cleaning prevents corrosion, buildup of grime, and improves tool performance.
2. Lubricate Moving Parts
- Apply a small amount of light machine oil to:
- Ratchet mechanisms (pivot head and internal gear)
- Extension bar joints
- Universal joints
- Wipe off any excess oil to prevent attracting dirt.
Do this monthly or after heavy use.
3. Inspect for Wear or Damage
Check regularly for :
- Cracks or chips in sockets and bits
- Rounded corners on sockets (especially from overuse)
- Worn ratchet teeth or damaged direction switch
- Corrosion or rust
Replace damaged tools immediately to avoid injury or damage to fasteners.
4. Prevent Rust
- Keep tools dry. After cleaning or use in damp areas, wipe dry before putting back into the case.
- Lightly oil metal surfaces if storing for a long time or in a humid environment.
Rust affects grip, safety, and strength — always store in a dry place.
5. Store Properly
- Always return each tool to its designated slot in the molded carry case.
- Close and latch the case securely.
- Store in a dry, cool environment, away from water, dust, or extreme temperatures.
Proper storage helps prevent loss, rust, and tool damage.
6. Avoid Misuse
- Use sockets only with hand tools — unless they are marked as "impact-rated".
- Do not use with power tools like drills or high-torque impact wrenches (unless explicitly compatible).
- Always use the correct size socket or bit for the fastener.
Misusing tools reduces lifespan and increases the chance of personal injury.
Note : Box Is For Safety Purpose.