... snatch block .double with shackle 1.Material: Stainless steel, Carbon steel, Alloy steel2.Size: kinds of3.Usage: Marine hardware, Building, Electric power, Machinery ... Main production:Rigging categories: shackles(JIS,DIN,US,EN, trawling shackle, deformed shackle, free forging, die forging, bow style, D style), turnbuckle ...