Brass rivet nuts [head type] 1. Flat head 2. Countersunk head 3. Small countersunk head [column type] 1. Park rod type 2. Groove 3. Hexagonal (semi-hexagonal) [stainless steel small countersunk head insert nuts column type] Carbon steel, aluminum, stainless steel, brass etc. [product specifications] 1. M3, m4, m m5, m6, m8, m10, m12 2. 6-32, 8-32, 10-32, 1/4-20, 5/16-18, 3/8-16, 1/2-13
