A mushroom head screw is a type of fastener that has a large, domed head that resembles the cap of a mushroom. The head of the screw is typically larger in diameter than the threaded portion of the shank, which allows it to be used in applications where a wider load-bearing surface is required. Modified truss head screws are suitable for various applications, including metal-to-metal, wood-to-metal, and wood-to-wood connections. They are commonly used in the construction industry for framing, sheathing, and decking applications.