The Alden 8403P is industrial strength and is made from high quality tool steel. It is designed to be used in a variable reversible drill but is also effective using a 1/4 inch hex screwdriver and extracts many type fasteners including: Phillips, Slotted, Hex, Trox, Tri-Wing,Pozidriv, Fearson, most tamper resistant screws and many more. Screw Sizes Number 16-24Bolt Sizes 3/8 InchMaterial SteelMade USA