ITEM NAME:5Pcs/Set Magnetic Triangle Head Screwdriver Bits S2 Steel 1/4 Hex Shank50mm #gib Store Home Promotion Hot Item Add to Fav.It made of high-strength S2 alloy steel, very durable. Magnetic bits, in the installation can easily absorb screws. Material: S2 Steel. Bits specification: 18; 20; 23; 27; 30. Hex Shank Size: 6.35mm (1/4").