IceToolz Chuck Adapter Chainset ToolThe IceToolz Chuck Adapter is specifically for use with the IceToolz crank extractor (sold separately) and provides an M12X1" thread. With this M12 threaded insert installed on your IceToolz crank extractor, you will be able to extra cranks that use the M12 thread size.Features: Threaded insert adaptor for crank puller Size: M12x1" thread Manufacturer's Part Number: 04B4Buy IceToolz Workshop from Chain Reaction Cycles, the World's Largest Online Bike Store.