Magnetic impact drill bit: The magnet that impacts drill bits is stronger than other drill bits, and it can easily and quickly fix more screws and prevent the drill bit from sliding. [Anti tips]: The magnetic screwdriver head set has strong magnetism and anti tips to that each edge can be accurately locked with screws. [ material] drill impact magnet is made of S2 steel, with high hardness, wear resistance, impact resistance, strong toughness and long-term durability. Long drill bit and high torque: The drill bit with built-in high torque and extended long drill bit helps absorb the high torque of the impact driver, thereby extending its service life [Widely used] These long screwdriver heads can be compatible with impact screwdrivers, electric screwdrivers, manual screwdrivers, 1/4 inch screwdrivers, rope drills, cordless drills, electric screwdrivers, manual screwdrivers, electric drills, pneumatic drills, etc. Impact driver bit sets are commonly used in mechanical equipment, automobiles, motorcycles, bicycles, furniture, electronic equipment, etc. Colour:Black Material:steel Size:25mm, 50mm, 65mm, 70mm, 90mm, 150mm Package Contents: 12 * screwdriver bit(25mm, 50mm, 65mm, 70mm, 90mm, 150mm, 2 each) 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.