Suggest every leather craftman own these. Mainly used on making belt,wallet,handbags,straps,collars,wallets,cases,bags,and so on. Pls make a hole before install the screws,you could use 3mm,3.5mm,or 4mm hole punch to punch a hole,or you could also use nails,screwdriver to make a hole. Color: Golden; Material: Brass Sturdy and strong snaps,hold firmly and really looks nice,easy to install that everyone knows how to use. We have following length screws to choose: 4mm(0.158inch),6mm(0.237inch),8mm(0.315inch),10mm(0.394inch),12mm(0.472inch),pls carefully choose the size you need. Packge include: 50 pairs 0.39inch(cap diameter)x0.315inch(length) backscrews fastenersPACKAGE INCLUDE: 50 PAIRS 0.39INCH X 0.315INCH BACKSCREWS FASTENERS. PLS MAKE A HOLE BEFORE INSTALL THE SCREWS.YOU COULD USE 3MM,3.5MM,OR 4MM HOLE PUNCH TO PUNCH A HOLE,OR YOU COULD ALSO. SIZE:CAP DIAMETER IS 0.39 INCH,FEMALE SCREW LENGTH IS 0.315 INCH WE SUGGEST USE THESE SCREWS FOR 0.308"-0.328" THICKNESS LEATHER. EACH PAIR HAVE ONE FEMALE SCREW AND ONE MALE SCREW. MATERIAL: BRASS COLOR: GOLDEN.Date First Available: November 23, 2017. Manufacturer: DGOL. Item Weight: 5.3 ounces. Is Discontinued By Manufacturer: No. Best Sellers Rank: #41,506 in Arts, Crafts & Sewing. Customer Reviews: 4.6 4.6 out of 5 stars 311 ratings 4.6 out of 5 stars. : B077PVNPDZ. Item model number: ABCD. Package Dimensions: 3.23 x 2.68 x 0.51 inches.