THE FACT ABOUT TYPES OF SCREW HEADS THAT NO ONE IS SUGGESTING

To paraphrase, 3 Robertson squares are superimposed in a successive 30° rotation. the look is comparable to that in the double-sq., in both of those cases The thought staying that it resembles a square (Robertson) but can be engaged at far more Repeated angles by the driver bit. These screws might be driven with standard Robertson bits. They are