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- screwdrivers, electric drills, air drills and so on. magnetic, great hardness, great torque, , 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 Quantity: 1 set Material: steel colour: silver Package Contents: 1 x screwdriver head 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.