Precision-stamped chrome vanadium chain wear indicator with satin chrome plating for corrosion resistance. Easy to use and accurately indicates chains stretched by 0.75 and 1% or more. Compatible with 7, 8, 9, 10, 11 & 12-speed chains. Precision-stamped chrome vanadium chain wear indicator with satin chrome plating for corrosion resistance. Easy to use and accurately indicates chains stretched by 0.75 and 1% or more. Compatible with 7, 8, 9, 10, 11 & 12-speed chains.