RONSTAN RF51100 Series 50 AP Block Universal Head Single Pulley, 3310 Lbs Load Capacity, 2" Sheave Pulleys for fibrous rope sizes 1/4" to 1/2". Series 50 all purpose pulleys are used in multiple industrial and OEM application that require an efficient and durable product Load ratings for these pulleys are exceptionally high for their size, starting at 1650lb for the all purpose single Becket pins are removable so lines can be spliced prior to fitting, and are ingeniously locked into position without the use of clevis pins, split rings or tools Shackles have slotted pins to avoid fouling lines