These 1/2 Inch pneumatic wrench hex- drill bits can install/ hex screws in a few seconds Save more time and energy Quickly insert a 1/2 Inch pneumatic wrench, and the socket head cap screw in seconds to improve work efficiency. Each edge of the hexagon can lock the screw accurately without damage. There is an anti-falling hole to improve the in use. Chromium-molybdenum steel precision forging, carbon black phosphating treatment, durable, suitable for industrial use. They have enough hardness and torsional force to prevent the tip from breaking and wearing. Suitable for all 1/2 inch pneumatic wrenches, electric wrenches, ratchet wrenches, quick wrenches, etc. It is very suitable for automobile maintenance, motorcycle maintenance, mechanical maintenance, furniture disassembly, construction site and other industrial purposes. Surface treatment: chromium plating Material: Chrome-molybdenum steel colour: black Package Contents: 8 x 1/2 inch pneumatic wrench hexagon drive drill bit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.