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Product Name: Tri Wing Screwdriver Color: Grey Surface Treatment: Sandblasting Materia: Those Screwdriver Bits are made of S2 alloy steel, which is a commonly used material in hardware with high hardness. Strong magnetic,can suck the screws easily when used it. External Hex Shank: 6mm/1/4" Pole Diameter: 4mm/0.15" Total Length: 50mm/2" Bit Type: Y1 Package Contents: 10Pcs x Tri Wing Screwdriver Application: Those bits fit for electric screwdrivers, hand screwdrivers, electric drills, air drills and so forth.