Br-tool workshop chain wear indicator ii

Checks the degree of wear and stretch of the chain, Compatible with shifting chains up to 12 speeds. Material: CNC machined 6061 aluminum. Indicators: 0.25/ 0.5/ 0.7/ 0.8/ 1.0%. Functions: - Checks the degree of wear and chain stretching.- Compatible with derailleur chains from single speed to 12 speeds.