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The models AB25, AB50 and AB60 have an outside diameter of .875 inches (7/8″) with a .1875 (3/16″) keyway. The key is included. Model AR100 has an outside diameter of 1.0 inch with a .25 inch (1/4″) keyway. The key is included. The AR250 has an outside diameter of 35MM (1.377″) with a 10MM (13/32″) keyway. The key is included.
