I too believe Zypher is the snap-on OEM, the first rumors of this...
It's not rumor. If you look at the older Snap-on bits they have the
Zephyr logo - the Z with a circle around it like in the photo but without the swoosh or airplane. Newer Snap-on bits do not have that marking.
ACR is a registered trademark of The Phillips Screw Company. Phillips claims:
"The ACR® Ribbed PHILLIPS® Cruciform Drive System advanced design keeps the driver securely mated to the screw
during fastener removal, eliminating recess damage and damage to surrounding areas. The results are securely removed screws every time with lower costs, more productive workers and fewer drill outs."
Phillips claims ACR benefits also include:
- Improved removal without cam-out
- Off-angle driving ability
- Interlocks in removal requiring lower end load
- Reduces worker fatigue
- Reduces scarring surrounding panels