GOOD USED INGERSOLL RAND 231 A HAMMER FRAME KIT: 231A, EARLY 244, MAC 234 AND SOME AW434, EARLY BLUE POINT AT123 AND SOME OTHERS LIKE EARLY MATCO MT1758 THE DIFFERENCE BETWEEN THE NEWER STYLE AND THIS OLDER STYLE IS THE HOLE AT THE BOTTOM OF THE HAMMER FRAME WERE THE ANVIL BOTTOM GOES INTO THE HAMMER FRAME IS SMALLER THAN THE SIZE OF A DIME PLEASE TAKE A GOOD LOOK AT THE PICTURES AND IF YOU HAVE ANY QUESTIONS PLEASE ASK.THANKS!
