The Allen 20mm Plain Bearing Triple Block is a superior choice for systems that do not require friction reduction or for take up systems. For optimal performance, we recommend using the Dynamic block range. Made from recycled plastics, this plain bearing block features an acetal sheave that rotates around a central axle, guaranteeing a long lifespan and minimal maintenance. The Ultra-Strap, a stainless steel strap, ensures a secure and rope-friendly attachment point while the hole in the middle of the block can be utilized as a becket for tying off.