The 6" length is the longest flat head Crete-Flex® we stock, for fastenings where the fixture stack eats the embedment — doubled ledgers, thick furring over uneven block, stacked shim packs, and treated plates over rigid insulation. Subtract your full fixture thickness from the 6" length to find your working embedment, and plan on at least 1" of thread in the base material. If you have more embedment than the job needs, the 5" version costs less, and the standard 1 1/4"–4" flat heads cover most direct-to-slab work.
410 stainless suits exterior and high-moisture work and far outlasts plated carbon steel, but it is not a marine-grade alloy. For direct salt spray, splash zones or submerged work, use a 316 stainless concrete screw.
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