The 20mm Plain Bearing Double Block is an optimal choice for systems that need friction reduction or take up systems. For the best performance, we highly recommend the use of the Dynamic block range. Made from recycled plastics, this plain bearing block has a long lifespan and requires minimal maintenance. The acetal sheave rotates on a central axle, providing a reliable and durable bearing. The Ultra-Strap, a stainless steel strap, securely holds the block together while also being gentle on ropes. Additionally, the becket feature allows for tying off through the center of the block.