These one-way shoulder screws are constructed of stainless steel and come in a satin finish. They feature a tamper-proof head which prevents them from being loosened and removed once installed. These fasteners are manufactured with #10-24 threads and have a reach of 1-1/16 inch, with a 1/4 inch outside diameter shoulder, and a 7/16 inch head diameter. One-way screws like these are commonly used with one-way barrel nuts in commercial restroom applications. The security drive heads of these fasteners allow for easy installation with a flat screwdriver, but require the use of a one-way screw remover tool for loosening and removing. See item number 650-7901 for screw sizes 6-8, model number 650-7902 for sizes 8-10, and model number 650-7903 for sizes 12-14, or model number 650-7904, which includes one of each one-way screw remover hand tools.