Heat treated alloy tool steel, one inch base fits wrench or bench vise. Thin wall construction allows use without removal of cones and locknuts.Fits all CampagnoloR cassette lockrings. Also fits CampagnoloR RecordTM, ChorusTM, CentaurTM and AthenaTM bottom brackets. The outside diameter of the BBT 5FR 11 is 22.8mm, and has 12 splines. Style number BBT 5FR 11
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