Accuhold Extension Holder 0.75in ID, 1in Shank, 5.25in OAL, 7/16-20 Screw, 1.25in dia x 2.25in long head with 2in hole depth
This is the tightest tolerance end mill extension used to reach into parts that need longer length. Precision end mills need precision extension holders to eliminate runout (TIR) and reduce tool breakage.
