[ALUMINUM BUILD] Made of aluminum these solid rivets are lightweight durable and resistant to wear making them a reliable fastening choice for indoor outdoor automotive and signage tasks. [M4 SIZE OPTIONS] Available in M4 x 20mm and M4 x 25mm these rivets help match different material thicknesses. Check your predrilled hole size and total stack thickness before installation. [FLAT HEAD DESIGN] The flat head shape supports a neat fastening finish and dependable hold. It is well suited to metal plates signage panels and repair jobs that need a clean practical surface. [SOLID STRENGTH] Built with a solid structure these rivets offer stronger more secure fastening than hollow types. They help create a permanent connection that stays firm during regular use. [100PCS EASY TO USE] This 100 piece rivet set is convenient hobby users and maintenance work. The smooth body supports efficient installation for automotive industrial and general metal projects., Manufacturer: Hyuduo