High-strength S2 alloy steel; Type of head: Triangle Head; Shank: 1/4 Inch Hex Shank; Bits Size (Triangle's Height ): 1.8, 2, 2.3, 2.7, 3 (Unit: mm), Length: 2 Inch/ 50mm; Magnetic bits, in the installation can easily absorb screws. Widely used power tools, electric screwdriver assembly, electronics industry; Also can be used household appliances, precision instruments industry, furniture industry screw equipment. Feature: It made of high-strength S2 alloy steel, very durable. Toughness is good, hard to rupture and wearproof. Magnetic bits, in the installation can easily absorb screws. Suitable for installation in pneumatic screwdrivers, electric screwdriver, rechargeable drill, using the wind batch. Widely used power tools, electric screwdriver assembly, electronics industry, household appliances, precision instruments industry, furniture industry screw equipment. Specification: Type of Shank: 6.35mm / 1/4 inch hex Material: S2 Alloy Steel Size: 1.8, 2.0, 2.3, 2.7, 3.0mm Total Length: 2 Inch/ 50mm Type: 1.8 mean triangle's height is 1.8mm 2.0 mean triangle's height is 2.0mm 2.3 mean triangle's height is 2.3mm 2.7 mean triangle's height is 2.7mm 3.0 mean triangle's height is 3.0mm Package Included: 5 x Triangle Head Screwdriver