Features: 1High Hardness: The nickel coating is uniform and dense, with high hardness, and the coating can be heat treated to improve its hardness. 2Brass Material: DIY leather rivets are made of brass material, the surfaces are flat and smoother, no burrs, excellent workmanship, sturdy and durable. 3Curved Surfaces Design: Book binding screw adopts curved surfaces design, smoother, excellent workmanship, beautiful and durable. 4Electroplating Treatment: Metal nail rivet studs adopts electroplating treatment, which is not easy to fade and paint, so that the surfaces of the product is bright and clean as new. 5200 Sets: There are a total of 200 sets of metal nail rivet studs, a large number to meet your use needs, can be used for a long time. Package included: 200 x BookandnbspBindingandnbspScrew(Sets) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.