Description: This bike chain checker tool is made of aluminum alloy material. Our bicycle chain checker is durable wear resistant long service life and has more refined appearance. This tool will quickly check chain stretch and wear to determine chain quality. You can quickly and accurately check any chain for wear. Compatible with 8-12 speed bicycle chains. Specification: Name: Bicycle chain measuring ruler Material: aluminum alloy steel Applicable: 8-12 speed chain Size: about 160x24x30mm/6.30x0.94x0.12in Weight: about 54g Use: measure the use of the chain ruler first adjust the scale and then put it into the chain to test. Note: The measuring ruler can not be inserted again and then turn the scale dial which will cause the pins to be bent and damaged. Packing list: 1 x Bike Chain Checker Note: Duetothelightingeffectsandshootingangles thereiscolordifferenceintheproduct pleaseunderstand. Duetomanualmeasurement thereisatoleranceintheproductsize. includes: Packing list: 1 x Bike Chain Checker Note: Duetothelightingeffectsandshootingangles thereiscolordifferenceintheproduct pleaseunderstand. Duetomanualmeasurement thereisatoleranceintheproductsize.