Durable spikes and studs made of zinc alloy, screws made of iron. Each spike has a smooth finish with no casting lines, fine workmanship and durable construction. Assorted sizes and colors: 5 different sizes of tree spikes, 70 sets of screwback studs in various sizes, along with 2 pieces of installation tools to meet your needs for different leathercraft DIY projects. Easy installation, even for beginners. Simple to use with included tools. Just punch a hole and screw on. These spikes will enhance the look of your DIY projects. Wide application for decorating shoes, belts, jackets, dog collars, garments, clothing, and other leathercraft items. Color: silver. Material: metal. Package contents: 32 x tree spike (8 x 12 mm), 16 x tree spike (6.5 x 20 mm), 8 x tree spike (10 x 20 mm), 8 x tree spike (10 x 24 mm), 6 x tree spike (10 x 27 mm), 70 x screwback studs (15/64 inch height), 1 x hole punch, 1 x screwdriver, 1 x clear storage box. Only the above package content is included; other items are not. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.