Allows for the flushing/lubrication of Shimano freehubs. Removal of freehub dust shield needed for interface (use: MG-2155 for dust shield removal). Replace old dusts hield with reusable dust shield for added protection (MG-2102) works with 8/9 speed Shimano hubs. Morningstar Freehub Soup lube (3 grades) recommended . Fits Shimano and most Asian-made freehub bodies that utilize loose ball bearings (not cartridge bearings).