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ARBOR ADAPTERS convert polishing or grinding wheels with 1'' arbor opening to fit smaller motor shafts. SHAFT FLANGES give polishing wheels extra side support; provide a bearing surface for the shaft nut so you can lock the wheel down tight. Mfg: Ain Plastics SPECS: Arbor Adapters - industrial polyresin. 1'' (2.5cm) O.D., 1'' long. May be shortened. Shaft Flanges - plated steel. 2-1/2'' (6.3cm) O.D. 1'' (2.5cm) I.D., 1/8'' (3.2mm) thick.