Paul Components Chain Keeper, BlackMachined aluminum Chain Keeper works either as a Singlespeed guide or with a 1X multi speed set up Clamp version mounts to the seat tube in place of the front derailleur Wide mouthed chain block and adjustable rod allow for precise alignment Not intended for DH, FR, or big hit use Made in USA Model Chain Keeper Mount 31. 8mm Color Black Weight 69g Chainguide Mount Type Seat Tube Front Derailleur Clamp 28. 6 (1 1 8"), 34. 9 (1 3 8")