Stainless Steel Fiddle Block 120-45-UC12 Series Fiddle Block with UC Ball bearing sheaves. Powerful aluminum sheaves run on Nomex(tm) Teflon(tm) composite bearing and twin ball bearing races for maximum thrust load capacity. Works with 120 55 UC for a powerful 4: 1 system. Stainless Steel cheeks are reinforced for high loads. Swivel head "D" Shackle may be locked in place. Bolted construction allows for disassembly and proper maintainence. Sheave Dia. 4" (102mm), Thickness 1 1 2" (38mm),
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