SMC JRB Double Pulley with Becket (Blue/Black) 3 Sigma MBS: 22kN (4,946 lbf) Becket Strength: 13kN (2,298 lbf) Certified to meet UIAA127/EN12278 Dimensions: 357" x 175'' x 156'' ) Max Rope: 9mm Sheave: 120'' nylon Stronger than most of the similar sized pulleys on the market Suitable for use in 2 to 1 C system or in 3-to-1 Z Drag system Wide base design has been proven to work efficiently with Prusik cords of up to 8mm