Bike Bottom Bracket Remover : It's made of High strength steel, and have 20 teeth , Great quality ensures that it will not damage the BB teeth. Suitable for any 20 teeth Standard Square Tapered crank sets. The bike crank extractor consists of a set of sockets that can be used with a wrench or an adjustable wrench. This set of crank puller bike tool and bottom bracket removal tool is a must-have tool for cycling enthusiasts and is also ideal for home repair tools for bikes. This bike tools Package Includes a crank extractor puller, a bottom bracket remover and a 16 mm spanner wrench. Notes: the crank extractor tool set is used to remove square type crank set, not fit octalink crank set.