Features: 1.Adopts high quality chrome?molybdenum steel material, with rust?proof and anti?corrosion properties, durable to use. 2.Hardening treatment improves the rotation power and reduces wear, ensures high working efficiency. 3.Carefully manufactured and designed, bit with precise chamfer can ensure smooth inserting. 4.Socket screwdriver bit with increased torsion and impeccable hardness, suitable for any 1/2in air impact/power bar. 5.The printed size information on the socket can helps you get a quick recognition. Specification: Item Type: Socket Screwdriver Bit Set Material: Chrome-Molybdenum Steel Color: Black Total Height: Approx. 78mm/3.1in Bit Diagonal Size: H5 : Approx. 5mm/0.20in H6 : Approx. 6mm/0.24in H7 : Approx. 7mm/0.28in H8 : Approx. 8mm/0.31in H10: Approx. 10mm/0.39in H12: Approx. 12mm/0.47in H14: Approx. 14mm/0.55in H16: Approx. 16mm/0.63in H17: Approx. 17mm/0.67in H19: Approx. 19mm/0.74in Square Socket Interface Size: Approx. 1/2in Application: Suitable for any air impact/power bar, etc. with 1/2in square drive interface Repair tool for home, automobile, etc. Note: Please allow 0?2mm error due to manual measurement. Thanks for your understanding.