5-PC. MULTI-FIT REAMER: Any pipe must have the bowl reamed periodically to prevent carbon build-up. You can choose from four different-size cutting reamers to fit your pipe bowl; each size is based upon common bowl dimensions for best fit. Designed for years of use. FOUR DIAMETERS: 5/8 in (1.6 cm.), 23/32 in. (1.75 cm.), 3/4 in. (1.9 cm.), 7/8 in. (2.25 cm.). Stores in custom fitted box. Imported.