Size: 16mm-18mm Material: Carbon steel, Alloy casting, Stainless Packing: Cartons or Gunny bags or Blister car Our products of Block: single pulley, double pulley, single pulley with swivel,double pulley with swivel, nylon pulley, steel pulley, snatch block model S, opentype, with hook, single wheel, regular woof block ,single wheel with shackle,HC series single wheel marine block, B series ...