5 Types of Screws Every DIYer Should Get to Know that will allow the tip of the screw to penetrate the bottom board by about 2/3 the thickness of that board.
Proximal phalanx - MCP joint - vertical shearing fracture - Lag screw fixation Screw length needs to be adequate for the screw to penetrate and purchase in.
Most drywall screws have a fine tip and a tapered bugle head to penetrate drywall without damaging it. Their coarse, wide threads tightly grip both wood and.
Concrete is a dense material, so you'll need a screw that can penetrate 1 inch ( centimeters) into the concrete; then add an additional inch ( centimeters).
Holes for concrete screws should be at least 1/4 in. deeper than the screw will penetrate to allow a little extra space for dust accumulation from the drilling.