... specification of our Products ? MaterialCarbon steel,Stainless steel,Alloy steel,Copper,Aluminum are available.Carton steel is high quality iron,such as 1022,1018,1010 ... ,1008,1015...Medium carbon steel are 35k,45#,10B21 ... !Welcome to call me any time !Tel:+86-15917002605 Stainless Steel Iron Dowel Spring Pin