NOTE: See the Flange Hole Diameter Reference Chart to check hole diameters for your specific flange. 42050-T (threaded) - for flanges with holes 1/2" to 1-7/16" in diameter. 42050-TL (large threaded) - is for flanges with holes up to 1-15/16" in diameter. 42050-TM (threaded - MINI) - for flanges with holes 5/16" to 63/64" in diameter. S