Low Friction Ring – 21mm HoleLow Friction rings can be used as a lightweight alternative to a block in some applications. They are best suited for systems requiring relatively small line deflection angles, or for high static loads. The design achieves a nicely rounded internal profile for smooth control line trim under load, and a deep external groove to retain the rope securely within the large shoulders when spliced into a loop. Features:Compact & lightweight Low friction Large shoulder secure allowing for rope lashing Durable Simple & reliable design Low maintenance Specifications:Color: BlackBox Dimensions: 1″H x 2″W x 3″L WT: 0.1 lbsUPC: 9316800525966