The CCP-4 is specifically designed to remove crank arms from Shimano® Octalink (splined, oversized "pipe billet") spindles, and ISIS Drive ® splined systems. It uses a long, comfortable handle and a fine thread for the leverage needed to remove tight crankarms. Rotating tip ensures smooth operation and long life. NOTE: CCP-4 will not work on crank arms that fit square, tapered bottom bracket spindles. Also note that crankarms with a "one-key release" system do not use any crank puller tool. The one-key system acts as the remover.