Casing bushings are cast from high strength steel and heat treated to provide maximum strength and durability. They are available for 17½" to 49½" rotary tables and can accomodate casing sizes from 16" up to 30" in diameter with interchangeable insert bowls. Models CU and CUL are solid bushings, while the Model CB is a split bushing. Insert bowls are used to accomodate various casing sizes; thus, one bushing can be used to run multiple casing sizes by interchanging these bowls.