SMC JR Double Pulley 3 Sigma MBS: 22kN (4,946 lbf) Certified to meet UIAA127/EN12278 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 Compact size fits in pocket or in backpack so that it is always handy for quick access in an emergency.