Single Screw Screw Screw 4x7mm Nickel Single Screw Screw Screw is a pair of head (female) and foot (male) and screw back fasteners. Use them for swatches or fabric swatches or additional albums. Recommended for those looking for a screw-type cascade. Although it has a similar role as a clamp, these screw-type screws are screwed on and do not require any tools to install, and they are also screwed, so they can be removed and reused. Use for objects with a total thickness of 0.3 inches (7 mm). For the hole that you put it on is suitable for 0.18 - 0.2 inch (4.5 - 5 mm) in diameter. Measurements are approximate. The color of the actual product and the color of the posted picture may differ depending on your monitor.