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If you're trying to keep your square taper, Shimano Octalink, ISIS, or other internal bottom bracket spinning consider our 1671.1/4 bottom bracket tool. It works in conjunction with our 1/2" ratchet or adjustable wrench to install and remove your cartridges. Made of hardened tool steel it should last a life time.
20 Tooth Bottom Bracket Tool for Shimano ISIS. Use with 1/2 ratchet.
Material: special tool steel, hardened and tempered.