Step 4: Tighten fasteners in the wall
Using a socket set, screw the nut into the masonry fastener. Tighten the nut to pull the anchor, compressing it against the concrete. Now use the socket wrench to loosen and remove the nut and washer, leaving a sufficient length of screw to hold the shelf.
Use a socket wrench to tighten the fastener in the wall.
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