Flat, Phillips screwdriver material: S2 alloy tool steel, Length: 25mm Inner ring materials of rotating gear: 420 stainless-steel (hardened through heat treatment) Outer ring material: titanium alloy Handle material: brass, titanium alloy Product length: 87mm Brass weight: Approx 35g Titanium alloy weight: approx 27g Packing: OPP ziplock bag