Dear , My name is Bob Doolin, from GMT Ltd, based in Hong Kong. In attach is K type rail clamp that we need. We need 4200 pcs, K type Rail clamp with base plate, as on picture. Please give us FOB price-China port. We need also attest or certificate of material from manufacturer. Best regards, Bob Doolin Sales Director www.gmt-hk.net 8 Hillwood Road, Tsim Sha Tsui Kowloon, Hong Kong Show More