Reliable nylon paddle lock sleeve with enhanced grip Reliable material and secure grip Made of sturdy nylon with multiple threaded rings on the outside to increase friction. Not easy to slip, so when the paddle is fixed, rowing becomes easier and more stable. Exact dimensions you can trust Inner diameter: 1213 mm (1/2 in) Outer diameter: 1516 mm (5/8 in) Height: 40 mm (1.6 in) Easy installation Install with a light hammer tap for a secure fit. Practical and reusable The paddle baffle and the paddle lock case fit closely and will not detach on their own. Reusable for multiple applications. Please confirm the product size and applicable size before buying. Use scenarios 1) Securing a paddle in a kayak or canoe paddle lock system to reduce movement and improve control. 2) Replacing a worn or loose paddle lock sleeve to restore grip and performance. 3) Field retrofit to accommodate different hardware by converting between 5/8 in and 1/2 in sizes, reducing metaltometal friction.