NOTE: See the Flange Hole Diameter Reference Chart to check hole diameters for your specific flange. 38240-T (threaded) - in protective carrying case with knurled nuts will fit flanges with holes from 1/2" to 1-7/16" diameter. 38240-TL (threaded large) - in sturdy cardboard box is the largest model. Fits flanges with holes 1/2" to 1-15