Type A point has a conical tip and spaced threads that are suitable for forming threads in holes drilled in thin metals between 0.015" and 0.050" thick and resin impregnated plywood
18-8 stainless steel provides good corrosion resistance and strength, and the plain surface has no finish or coating
Pan head has a flat top and short vertical sides with a rounded top edge
Star drive has a six-pointed indentation that provides a large contact area for the driver, resisting slippage better than a Phillips or slotted drive