For 3/4" to 3-3/4" (20 to 95mm) shaft diameters
For 1-1/4" to 6" (32 to 150mm) shaft diameters
For 1-1/4" to 8" (32 to 203mm) shaft diameters
For 4" (100 to 165mm) to 6-1/2" shaft diameters
For 7" to 8" (178 to 203mm) shaft diameters
