AutumnFall Pulley System Stainless Steel Carabiner Opener Outdoor Multi-Tool Stainless Steel Size: 90mmX38mmX7mm/3.54"X1.50"X0.28" 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). Integrated karabiner pulley system specifically designed to be used with paracord. Use the Para-Pulley singularly for directional change and greatly reduce friction.