Bicycle Crankset Crank Wheel Puller Extractor Bottom Bracket Removal Repair Tool Features: Made of high-carbon steel material, durable and timeproof Standard size, suitable uitable for any 20 teeth splined type bottom bracket Used to remove square type crank arms, all you need is either a 5/8 or 16mm spanner or just an adjustable spanner The Bottom Bracket Remover can be used with either a 24mm socket, wrench or an adjustable spanner Simple to use and requires no rocket science. 1. Remove the bolt in the crank arm 2. Screw the lower black part of the tool into the crank till tight 3. Screw in and continue to tighten the silver piece of the tool until the crank starts to move Package includes: 1x Crank Extractor 1x Bottom Bracket Remover