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1.There are four models of Hook / Block Assemblies at your option: YG90,YG135,YG170,YG450. 2.The main parts are made of high strength alloy steels and are subjected to nondestructive testing. 3.The pulley has been intermediate frequency quenched, which can improve the hardness of the surface, the wearness, and the service life. 4.The Hook / Block Assemblies conform to API Spec 8A 8C and are used API monogram on them.Hook / Block Specifications: ModelYG90YG135YG170YG225YG450Max Hook LoadKN9001350170025004500Us ton100150200250500Pulley O.D.mm76291591511201524in3036364460Pulley Qty.44556Wire Rope Diametermm2626293238in1"1"1-1/8"1-1/4"2"Main Hook Opening Sizemm155165180190220in6-1/16"6-1/2"7"7-1/2"8-5/8"Main Hook Diametermm116140150160180in4-1/2"5-1/2"6"6-1/4"7"Assistant Hook Diametermm809090100120in3-1/8"3-1/2"3-1/2"4"4-3/4"Size (L×W×H)mm2908×806×5333195×960&ti