Suitable for all common bicycle chains. Crank puller color: black and silver are suitable for the expansion ejector of the square cone crank set. The detachable chain link and crank are easy to install and use. Universal bicycle crank puller. It is an ideal choice for any home bicycle repairer. Tools essential for outdoor riding are convenient and practical. To help you get out of trouble quickly, you only need to use a monkey wrench or a 5 or 8 or 16mm wrench, and then: remove the bolt in the crank arm and screw the black bottom of the tool into the crank until it is tightened and continue to tighten the silver part of the tool until the crank starts Move so far. Lower bottom bracket removal tool material: carbon steel color: silver size (approximately): 3 x 5 cm or 1.2 x 2.0 inches (depth x height) easy to carry and store. An essential tool for bike lovers. Using high-hardness carbon steel, the surface is nickel-plated, which is very durable. Bicycle bottom bracket removal tool, with 20 teeth, used to remove the bottom bracket of the bicycle.