Features:Suitable for square tapered crank sets.Extended ejector for removing chain-rings and crank.Easy to install and use. Universal bike crank puller.It is ideal for any home bike mechanic.A necessary tool for outdoor biking.Practical and more convenient. Helps you get out of troubles Fast.Description:You just need an adjustable spanner or a 5/8 or 16mm spanner, then:1. Remove the bolt in the crank arm2. Screw the lower black part of the tool into the crank until tight3. Screw in and continue to tighten the silver piece of the tool until the crank starts to moveSpecifications:Brand: noneMaterial: steelItem size: 79*21mmNet weight: 123gColor: Black & silver Packing Content:1 x Crank Puller Tool