Make your chain checking accurate and easy with this easy-to-use chain checker. 
-Quickly and accurately determine the wear and stretch of chain
-Net Weight: Approx.32g
-Size: 135*23*30mm
-For 9 and10 speed chains, replace chain at or just before the 0.75% readings
-For 11 speed chains, replace at or just before the 0.5% reading
-Use: Insert the chain checker’s pins into two links, press the swing arm gauge tight,
and check the gauge window for an accurate reading.