It is designed to work with internal thread size of 1/4"-20..If you are looking for a bushing and mandrel set to use with your thread insert tools, then this ZORO SELECT product will be an ideal choice. Bushing/Mandrel,1/4-20,For 5TUW2/5TUW3 This ZORO SELECT 5PWZ4 Bushing/Mandrel is a 1/4-20 bushing and mandrel set that can be used with the thread insert tools in the 5TUW2 and 5TUW3 series.
.Model Number L805102, Finish/Coating Heat Treated, Overall Length 1 in, 1 11/16 in, Overall Width 5/16 in, 3/8 in, 1 in L x 5/16 in W Latch Spring, Material Stainless Steel, For Use With Grainger Item Number 2CUA1A, For Use With Mfr.