DESCRIPTION : The Chicago Screw is a screw fastening hardware featuring a slightly raised hexagonal star shape on the top and a flathead screw on the matching bottom. The detailed design on both sides ensures it looks attractive both inside and out. With screw fastening, it accommodates a larger range of leather thicknesses. Both sizes have the same screw length and can accommodate leather thicknesses from 3mm to 5.5mm. If needed, you can change the bottom to longer screws for additional thickness. Material: Silver : Stainless steel Gold : 24K gold plated stainless steel Properties : Laser printing and etching compatible Dimensions : 6 mm:Top Hexagon (Inscribed Circle Diameter) x Bottom Screw Diameter x Stem Height x Total Height6 mm x 6 mm x 3 mm x 7 mm (0.24" x 0.24" x 0.12" x 0.28") 8 mm:Top Hexagon (Inscribed Circle Diameter) x Bottom Screw Diameter x Stem Height x Total Height8 mm x 8 mm x 3 mm x 7 mm (0.31" x 0.31" x 0.12" x 0.28")