The Allen 20mm Tii-On Plain Bearing Block is a durable and reliable choice for your take up systems or systems that don't require friction reduction. Made from recycled plastics, this block features a long-lasting acetal sheave that rotates around the central axle. With minimal cheek separation and a stainless-steel head loop ensuring proper orientation during use, our Tii-On blocks are designed for maximum strength. To properly attach this block, simply feed the rope around the central axle and through the head of the block. For optimal performance, we recommend the use of our Dynamic block range.