A socket wrench set called the 1/2DR 36Pcs Pear Head Ratchet Set stops your sockets from coming off when you're not expecting them to. It has a lockable ball that prevents it from slipping off by requiring a press on the ratchet head to release a socket. It is a very powerful tool because it is made of chrome vanadium steel and has a chemically resistant ergonomic biomaterial handle. If you work in a field where you may need to work quickly or with wet hands, or if you just want the security of knowing that your sockets won't come loose while you're working, this is a great product for you. Pear Head Ratchet is produced in accordance with ASME B107, 10M-2005, IOS 3315, DIN 3122, and IOS 1174-1.