Product Description The Shimano TL-CN42 Chain Wear Indicator measures the wear of your chain The Shimano TL-CN42 chain wear indicator is a gauge that allows you to determine the level of wear of a chain accurately, easily and quickly. Laser cut and 3-pin design ensure maximum precision. TL-CN42 is made of heat-hardened steel. Specifications:Function:measuring toolTool Type:gaugeTechnical Information:Material:stainless steelFeatures:high precision via laser cuttingunique 3-pin design allows accurate measurementheat-treatedNote from the manufacturer:A worn chain does not reach the original Shimano shifting performance and wears sprockets and chainrings faster. Manufacturer Number:Y-12160000 Contents:1 x Shimano TL-CN42 chain checker Manufacturer: Shimano Europe B.V. High Tech Campus 92 5656 AG Eindhoven Netherlands info@shimano-eu.com