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Rounded Head Style
Tamper-Resistant Tri-Groove-Drive Steel Round Head Screws
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Good luck trying to force off these screws. The tri-groove drive has a sloped shape with three notches that makes it nearly impossible to grip without a tri-groove driver. They're often found on electrical boxes, machine control panels, and critical equipment where unauthorized access is a concern.
Length is measured from under the head.
Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
Power Tool Bits—Pair these bits with your power tools to turn screws more quickly than manual tools.
