Vktech&reg; EDC Para-Biner Pulley System Stainless Steel Carabiner Opener Multi-Tool Size: 90mm * 38mm * 7mm/3.5"L*1.5"W*0.27"H, thick and hard Material: High Tensile Stainless Steel Offers 5 wrench openings 15/16", 9/16", 1/2", 7/16", 3/8", 5/16", 1/4" (bit driver) Use the Para-Pulley singularly for directional change and greatly reduce friction Single pulley allows for lines up to 1/2" diameter