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Steel 4x4 box for concrete block walls. 1/2" and 3/4" knockouts. Spring steel clip holds box securely against walls when screws are tightened. Screw hole pattern for 4x4 and two gang devices.
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How to Choose and Use Concrete Fasteners, Masonry Screws | Concrete block walls, Concrete, Concrete diy
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Tapcon 1/4" x 1-1/4" Star Torx Head Concrete Anchor Screws 3183407V2 | 100 Pack | Drill Bit Included: Amazon.com: Industrial & Scientific
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Tapcon 3/16" x 1-3/4" Star Torx Head Concrete Anchor Screws 3171407V2 | 100 Pack | Drill Bit Included: Amazon.com: Industrial & Scientific
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Tapcon Part # 24301 - Tapcon 1/4 In. X 3-1/4 In. Hex-Washer-Head Concrete Anchors (75-Pack) - Masonry Screws - Home Depot Pro
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