... endure biggish impact loading. Roller Diameter:25.4, 38.1, 50.8, 57, 60, 63, 75, 89, 104(mm). Installation method ... (chroming), wrap plastic etc. Roller Sort:Metal (plastic) end cover, taper, accumulate, right angle knuckle roller, block side roller. Small end ... diameter of taper roller:38.1 mm, 50.8 mm.Supporting Bearing: precision bearing, pressing bearing ...