CNC process surface frosted aluminum lock conversion base, chain guide mounting baseSuitable for frames without ISCG mounting holes. Note that the must be screw-in and the bottom bracket must be Peeling (such as BB51, BB70, etc.).Press-fit bottom brackets are not available.Model Number: Bottom bracket () adapterPrimary Uses: -Mount /Single ring chain guidesize:8.5cmMaterial:aluminumcolour:blackPackage Contents:2 x Chain guide repair parts(Products not included Chain guide)6 x ScrewsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.