Chain Tensioner - , made of iron and plastic material, durable for long-term use. Chain Adjust Tensioner - Easy to install, non-damaging to the frame, automatically adjusts chain tension, eliminating the need for manual adjustment. Chain Adjust Tool - Solid and durable design, effectively prevents chain slippage. Motorcycle Chain Tensioner - Improves riding safety, abrasion resistant and durable, helps enhance tire performance. Adjustable Chain Tensioner - Suitable for most motorcycles, compatible with modified motorcycles, automatically adjusts large chain tension. Specifications: Color options: black, blue, red, yellow Size: roller size 6.5 x 4 cm Package includes: 1 pc motorcycle chain tensioner Notes: When installing the circular frame, use rubber or similar material as padding to protect the mounting area. Screws may require extension; buyers should measure their vehicle dimensions before purchase to ensure compatibility.