Combi-Dies - BA Sizes Self-Centering Guide1. Sell-centering guide ensures proper alignment2. Simply insert rod or damaged bolt into guide3. Turn clockwise to begin threading Features:Solid, Precision, Toolsteel Die, needs no adjustment ( replaces a Dienut on many applications.) Used with a good quality lubricant , Comb-die cuts perfect threads, time after time, without reversing. Light, Unbreakable (in normal use) Diestock with permanently bonded Die and Guide. Combi-die is light in the tool box or hangs on a workshop tool rack (protective wallet supplied)Guide holds cutting due in correct alignment with the workpiece. Combi-die promotes square cutting, prevents uneven threads an so improves die life. Please select a size from the pull down menu