Especially useful in metal-to-metal or where heavy duty fastening is required.50 x 20 mm Phillips Truss Machine Screw, Zinc Plated Steel, 20 PK Commonly used with flat or lockwashers. Machine screws are used in fastening nearly all types of hard materials..
Sheet Metal Screw, #10 x 1-1/4 in, White Steel Flat Head Phillips Drive, 25 PK Sheet metal screws make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood..
.Self-Drilling Screw, #10 x 1-1/2 in, Stainless Steel Hex Head Hex Drive, 8 PK Ideal for any project involving light gauge sheet metal, awnings, door and window frames, gutters, sheds.