Made specifically for fastening multiple trusses and engineered-wood assemblies, Strong-Drive SDW screws can be used to join up to four plies of 2-by or 1 3/4-inch-thick materials. Fastening can be done from one side of the assembly, which eliminates a lot of heavy lifting. The screws have a large, flat head and a partial-thread design that draws materials together tightly. They come in eight lengths from 2 7/8 to 6 3/4 inches and cost $30 to $90 for a box of 50. Simpson Strong-Tie, 800/999-5099,

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