The MOST precise extension holder you have ever used.
Concentric within .0003; Hole size is plus .00015 and minus Zero.
Improves rigidity, concentricity, and coolant effectiveness.
*The ACH1/2 and 12MM have a 1 Dia. X 1.5 long head.
**The ACH3/4, ACH1, and 18MM have a 1-1/4 Dia. X 2-1/4 long head and the holes are only 2" deep.
Accu-Hold ACH Series