Product Description Always shows an exact result: the CC-3.2 Chain Checker by ParkTool A worn chain provokes poor shifting behaviour and drastically shortens the service life of the sprockets. The CC-3.2 wear gauge shows exactly whether a chain is still within the tolerance of 0.5 or 0.75 % elongation - the values at which most manufacturers recommend changing the chain. The revised CC-3.2 is longer and even more accurate and offers permanent measurement markings. Technical Information:Type:two-sidedMaterial:steelChain Compatibility:1/2" ; 1- to 12-speedWear Values:0.5%, 0.75%Features:made of laser-cut precision steelwith permanent measuring markwith 0.05 mm side for 11- and 12-speed chainsManufacturer Number:CC-3.2 Contents:1 x ParkTool TS-25 chain checker Manufacturer: Park Tool Company 1185 Eagle Lake Rd Shoreview MN 55126 USA info@parktool.com Distributor: GROFA Action Sports GmbH Otto-Hahn-Straße 17 65520 Bad Camberg Germany info@grofa.com