MATERIAL - These blind rivets are made of a high-quality aluminum nail body and a steel nail core. The rivet surface is smooth. It is durable and easy to use. RIVET SIZE - 4.8mm x 12mm (3/16" x 1/2"). The diameter is 4.8mm, and the shank length is 12mm. EASY TO USE - Easy to connect. The rivet shank is shaped like a drill bit, allowing for direct use in setting and drilling into the base material. This saves considerable construction time. VERSATILE APPLICATION - Compared to soft rivets, the clamping force of the joint is more balanced. Used in steamships, automobiles, mechanical equipment, household appliances, etc. PACK - Pack of 100 pieces