China Cable Wired Pulley Block:Cable Wired Pulley BlockStandard: CB/T3759-1995TYPE: A1C〠A1Y〠A1JSWL: 10-100KNFor Wire Dia: 13.5-34.5mmTYPE: A1CS〠A1YS〠A1JSSWL10KFor Wire Dia: 16N 13.5-34.5mm