Economy Grade
SPTZ Bladed/Taper PDC Mill

The SPTZ can be purpose-built to fit several different practical applications. The basic mill has 4 or 5 blades set with 8mm, 10mm, or 13mm PDC Cutters
Used for hard scales the taper (flank angle) is 15 degrees but for Frac Plug removal the flank angle is steeper at about 5 to 7 degrees to deal with the slip wickers and/or slip buttons.