characteristic For the repair and maintenance of electronic, electrical and mechanical equipment These screwdriver bits are made of S2 alloy steel which is a material commonly used in material with high hardness. These magnetic bits that can be securely fixed on the screwdriver, worthy of electric screwdrivers, hand-held screwdrivers, electric drills, air drills and so on. magnetic, great hardness, great torque, long life, and can suck the screws easily when working, each edge can be safely locked screws, without damaging the screw and screwdriver head describe Name: screwdriver head set Material: steel color: silver Quantity: 1 set Package Contents: 1 x screwdriver bit set 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.