Bolts are beveled under the head for a flush finish in countersunk holes. Also known as sleeve anchors, these have a sleeve that expands for a secure hold in block and brick. They're often used to hold steel and wood panels, doors, framing, and shelving. To install, tap the anchor into a hole and tighten the bolt to expand the sleeve. As you tighten, the nylon ring compresses to secure the fixture against the base material. Made from zinc plated steel, they resist corrosion in wet environments. Pull-out strength and shear strength values are 25% of the ultimate values.

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