Birzman Universal Crank Puller Description: The Birzman Universal Crank Puller works to address ISIS Drive, Octalink and square tapered crank arms. The Birzman Universal Crank Puller is equipped with a spindle driver with self-rotating tip to facilitate crank arm extraction. A built-in protection ring helps prevent damage to crank arm threads from over-threading. Features: Universal Crank arm puller intended for use with ISIS drive spindles, Octalink Spindles and more Removable nut enables use with square tapered crank arms Can be used with a 15mm wrench for better grip Specifications: Material: Alloy (Steel) Color: Silver