when they appear like a normal flathead style, they've got two holes in the groove that have to be contacted for them being correctly pushed into the material. you need to use an Allen wrench to generate inner hex screws. When Utilized in household furniture installation, the internal hex screws ordinarily feature a matching-sized Allen wrench. i

A U-generate screw features a helical thread by having an angle acute enough to generally be driven by a hammer or pressure from an arbor push, and thus contains a domed head without any implies of turning it.[ninety] these are generally most frequently pushed into plastics with a pre-drilled pilot hole. See also[edit] These are employed where by