401 to .498 size Shank Adapter. Use to adapt the .401 Flow-Forming shank to fit a .498 rivet gun, or to adapt TM Air Hammer Dies with .401 shanks to .498 Air Motors.: TM Technologies
7 Pc 7-1/2'' Air Hammer Kit w/ 5 Chisels 190mm 3000RPM 90PSI 1/4'' NPT Air Inlet - Walmart.com