Park Tool DH-1 Dummy Hub Also called a sleeping hub, the Park Tool DH-1 slides into rear dropouts and replaces the rear wheel for chain cleaning and transport. The DH-1 works with all derailleurs and 1/8" chains. The unique design allows the bike to be shifted and works with open dropout and thru-axle frames up to 12mm. Features Dummy hub holds chain for cleaning and transport Compatible with all derailleurs and 1/8" chains Works with open dropout frames and thru-axles up to 12mm in diameter Related Articles: CHAIN CLEANING WITH A PARK TOOL CHAIN SCRUBBER Manufacturer's Part No: DH-1 UPC: 763477002709 | Park Tool | Dh-1 Dummy Hub Dh-1 | Rubber