Yamaha RD Billet Chain Adjusters. Yamaha RD250/350/400 & RZ350. Sold in pairs. Racing inspired design replaces that common bolt found on stock bikes. Features a fully CNC machined knob section with 3 methods of adjusting 1) by hand with the knurled section, 2) with an open or box end wrench on the hex, 3) with an allen wrench through the end of the knob to the 18-8 stainless steel screw! Available in your choice of 3 finishes: clear, black, or red Anodized and includes a "gold" cad plated alloy lock nut. Click picture for larger and other views. Note: Includes cap and bolt only, does not include adjuster bracket.