CAMTOA Multifunctional Pulley system Para-biner Carabiner Stainless-Steel Opener Material: High Tensile Stainless Steel Weight: 88g Offers 5 wrench openings 15/16", 9/16", 1/2", 7/16", 3/8", 5/16", 1/4" (bit driver). Single pulley allows for lines up to 1/2" diameter.