The Allen 30mm Plain Bearing Triple Block is the perfect option for systems that don't require friction reduction, such as take up systems. Alternatively, for the best performance, we recommend the Dynamic block range. Made from recycled plastic, this plain bearing block has a long lifespan and is low maintenance. The acetal sheave rotates around the central axle, and the ultra-strap, a stainless steel strap, securely holds the block together and offers a strong attachment point for ropes. The hole through the middle of the block can also be used as a tying off point, known as a becket.