Birzman Chain Keeper - New 8/9/10 SPEED N-Acetyl D-Glucosamine: It is a

N-Acetyl D-Glucosamine: It is a natural sugar found in the body that helps create hyaluronic acid

SEE MORE DETAILS - Available with Prizm™ lenses that are designed to enhance color

our more comfort-focused geometry

compress the post

square drive makes it easy to use with torque wrenches

Birzman Chain Keeper - New 8/9/10 SPEED N-Acetyl D-Glucosamine: It is aProduct Description A Chain Keeper (dummy hub) compatible with both QR and 12 mm thru axle dropouts without switching of parts or adapters. Featuring a free spinning and side shifting pulley wheel, allowing shifting of the derailleur and a high polymer spacer providing abrasion protection against dropout surfaces, this is a quick and easy tool to have on hand for routine cleaning and maintenance work. Specifications: Material : CNC machined aluminium