Product Description Flat-head screw insert for 3/8" . Technical Information:Blade Material:chrome-silicon-manganese-molybdenum steelSocket Material:CrV steelDrive:3/8"Length:50 mmSizes (FD):FD 4.0 / FD 5.5 / FD 8.0 mmManufacturer Numbers:FD 4.0 mm:23591FD 5.5 mm:23592FD 8.0 mm:23593Contents:1 x Proxxon 3/8" flat-head screw insert Manufacturer: PROXXON S.A. Härebierg 6-10 6868 Wecker Luxembourg office@proxxon.com