The Allen 30mm Plain Bearing Swivel Block with Hook is perfect for take-up systems or systems without friction reduction. For the best results, we recommend our Dynamic block range. This block is made from recycled plastics for sustainability. Thanks to its built-in swiveling hook, it can easily attach or remove and swivel to align with changing pulling forces. The durable acetal sheave spins on a central axle, providing a long lifespan and low maintenance. You can also use the block's hole as a tying off point.