Install these tamper-resistant screws in corrosive environments with a common slotted driver. Once installed, the drive’s sloped walls cause drivers to slip, making these screws difficult to remove without one-way screw removers. They're often found on public facilities, such as restroom partitions and other long-term installations, where tamper resistance is important and removal for maintenance is unlikely.

Length is measured from under the head.

One-Way Screw Removers—Extract one-way screws. With two pins on the driver's end, they grip one-way screws to loosen them when slotted drivers just slip.