Pin 8×40 (10 Pieces) For 105-135 Gear Box of 4 Stroke (178F, 186F, 188F & 177F) Power Tiller is a precision-engineered dowel or rotary pin set sized at 8 mm diameter and 40 mm length. These pins are commonly used for secure fastening, alignment, or linkage in gearbox assemblies of micro tillers powered by 4-stroke engines (compatible with 178F, 186F, 188F, 177F models).