Description: Durable and Wearable: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. Check Wear:This tool will quickly check chain stretch and wear to determine chain quality. You can quickly and accurately check any chain for wear. Portable Design:Chain Wear Indicator is a portable maintenance tool for cycling enthusiasts. It is sturdy and durable easy to carry and can be used in a carry-on car bag. Easy to Use:Just insert the chain wear indicator into the two cables lightly press the rocker arm gauge and check the meter reading is accurate. The chain wear indicator will determine if the chain needs to be replaced. Wide Compatibility:Used to detect the length and angle of the chain compatible with 8-12 speed bicycle chains easy to use and carry convenient and practical. Specification: Material: aluminum alloy steel Size: about 160x24x30mm/6.30x0.94x0.12in includes: 1 x Bike Chain Checker