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If you're fastening into concrete, brick, or block, these Tapcon screws are what you need.
This 10-pack gives you 3/16 inch diameter by 3-1/4 inch length Phillips flat head screws that bite into masonry like nothing else.
They're made from steel with a blue Ruspert coating – that's a step up from plain zinc plating, giving you better rust resistance, especially in damp or outdoor conditions.

These are ideal for a bunch of projects around the house, farm, or business – think anchoring shelves to concrete walls, mounting equipment, or securing framing in basements and garages.
They're heat-treated for strength, so they hold up under load without snapping or stripping out.
Just drill the right pilot hole, drive 'em in with a Phillips bit, and you've got a permanent anchor that's not going anywhere.
The flat head sits flush, which looks cleaner and doesn't catch on things.
Keep in mind, always test on your specific material and consult a pro for structural jobs – but for general heavy-duty anchoring, these are solid.
Hard-to-Find Fastener stocks a huge variety, so if you need something specific, they probably have it.
This is a straightforward, reliable screw for concrete work that won't let you down.