Fastener 1.Material:Cast iron,carbon steel 2.Weight:0.05 ... Certificate: ISO9001 Construction Fastener 1. Material: Gray iron & ductile iron & malleable iron according to ASTM, DIN,JIS, EN, ISO, ... to customers' requirements, such as oil dipping, plating,black oxide treatment5. Application: Construction/building industry, machinery,etc. ... competitive price and on-time delivery. Cast iron Fastener