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
Steel is often used in applications where strength is the primary consideration, and the black oxide finish offers mild corrosion resistance and lubricity
Truss head has an extra-wide low-profile domed shape for applications with minimal clearance
Phillips drive has an x-shaped slot that accepts a Phillips driver and is designed to prevent over-tightening