High strength S2 alloy steel, durable and long using time. Size: W 1.8, W 2.0, W 2.3, W 2.7, W 3, 0; Shank: 6.35mm / 1/4 inch; Total length: 50mm Magnetic bits, when installing, can easily absorb screws. The surface is smooth, not easy to break and wear-resistant. Suitable for installation in pneumatic screwdrivers, electric screwdrivers, rechargeable drills, using the wind set. Feature: It is made of high-strength S2 alloy steel, which is very durable. Toughness is good, not easy to break and resistant to wear. Magnetic tips, in the installation can easily absorb screws. Suitable for installation in pneumatic screwdrivers, electric screwdrivers, rechargeable drills, using the wind lot. Widely used power tools, electric screwdriver assembly, electronic industry , household appliances, precision instrument industry, screw electrical equipment for the furniture industry. /p> Type: The height of the mean triangle 1.8 is 1.8 mm < / p> The height of the middle triangle 2.0 is 2.0mm The height of the middle triangle 2.3 is 2.3mm The height of the mean triangle of 2.7 is 2.7 mm The height of the mean triangle 3.0 is 3.0 mm Contents: 5 triangle head screwdrivers