Lupo Bike Crank Puller Extractor Remover Tool - Universal fit for Mountain MTB Road Bike Bicycle Cycle &hellip; Simply Remove the bolt in the crank arm using a spanner Screw the lower black part of the tool into the crank until tight Screw in and continue to tighten the silver piece of the tool until the crank starts to move Easy use & suitable for beginners Suitable for standard square tapers