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Steel Sheet Metal Screw, Zinc Plated, Pan Head, Square Drive, Type A, #14-10 Thread Size, 1-1/4' Length (Pack of 25): Industrial & Scientific. Steel Sheet Metal Screw, Zinc Plated, Pan Head, Square Drive, Type A, #14-10 Thread Size, 1-1/4" Length (Pack of 25): Industrial & Scientific. The zinc plated steel sheet metal screw with pan head and square drive has a Type A point for forming threads in thin metals between 0.015" and 0.050" thick and resin impregnated plywood. The Type A point has a conical tip and spaced threads. Steel is often used in applications where strength is the primary consideration. The zinc plating offers corrosion resistance and has a reflective appearance. The pan head has a flat top and short vertical sides with a rounded top edge. The square drive resists slippage better than a Phillips or slotted drive.。Sheet metal screws, a type of self-tapping screw, have threads down the entire length of the shank for tapping and fastening thin material. The point style determines the type of material the screw can be used on, such as metal, wood, or plastic. These screws commonly have a sharp point that helps penetrate the material.。 。 。 。