ISC CAST PULLEY FOR 19 MM (3/4) ROPEISC Cast Pulley for 19mm (3 4") Rope RP055A1 ISC's attention to manufacturing details is superb. Smooth edges, bright visible colors, and smooth operations. ISC blocks are tried and true. FEATURES Easy one hand operation Push pin release Material: Aluminum SPECS Max Working Rope capacity: 19mm 3 4" (106 kN 23,400 lbs) MBS: 150 kN 33,000 lbs WLL: 30 kN 6,600 lbs Topping Strap Size: 29 mm 1 1 8" (213 kN 46,800 lbs) MPN: RP055A1