The Park Tools CWP-7 Compact Crank Puller is a universal tool for removing both square taper and splined crank arms from 3-piece bicycle crank systems. The swappable rotating tip smoothly and securely presses the crank arm away from the bottom bracket spindle. The extra fine threads provide the needed leverage to remove even the tightest cranks. The CWP-7 requires the use of an adjustable wrench. It's compatible with systems that use an M8 x 1.0 threaded crank bolt for the small swivel foot and the large swivel foot is compatible with systems that use M12 x 1.0 or M15 x 1.0 threaded crank bolts. The CWP-7 Compact Crank Puller is a staple for the at-home bike mechanic!