【Bike Crank Extractor/Puller】: Bike crank puller can be used with an 16mm spanner wrench. 【Square Head & Allen Wrench】:Bike Allen wrench is used to unscrew the screw of crank.Use a square head,allen wrench and bottom bracket remover to replace old bottom bracket.Place the bike bottom bracket remover into the crankset, then put in the square head and the allen key,use leverage to loosen the old bottom bracket.
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