1)Material: C1022 carbon steel 
2)Dia:3.5mm,3.9mm(#6,#7) 
3)Length:25mm, 35mm,45mm,55mm 
4)Surface:, black or grey phosphated  
5)Head:Flat bugle head Phillip recess 
6)MOQ:1000,000pcs 
7)Packing: bulk, small box packing