This is a Genuine Yamaha replacement Cam / camshaft timing chain rivet type master joint link , type BF05M , by TSUBAKi

Fitment for many old Yamaha models XS250 XS360 XS400 XS650 XS750 XS850 XS1100 XJ650 XJ750 XJ900 XT500 SR500

This is only suitable to fit the original Yamaha Tsubaki  BF05M chain.   It must not be fitted to any other type of chain

Ask if you are unsure regarding suitability for your chain