The product is forged from high hardness chrome vanadium steel. The surface is treated with anti-corrosion sand blasting. After the whole high temperature quenching heat treatment, the product has high hardness and is durable.

It is widely used in electric drills, screwdrivers, impact drills, household DIY, auto parts, woodworking, professional machinery maintenance and other fields.

The universal 1 / 4 "hexagon handle is used for the sleeve, and each hexagon nut screw driver head is clearly marked, which can be used for various quick change chucks, flashlights and screwdrivers.

10PCS Inch：5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 7/16, 1/2.

10PCS Metric: 4mm,5 mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm.