MT1-50PK 1/4” MorTorq #1 50PC Hex Insert Screwdriver Bit Pack. The MorTorq Spiral Drive recess developed by Phillips, is much shallower than other standard recesses on the market, and can be put into a much shallower head without affecting the strength of the screw.

This assembly allows for a shallower counterbore, reducing material thickness without compromising the joint strength, because it does not affect the material thickness below the counterbore. A MorTorq recess uses full wing contact with driver bit in both drive and removal directions