These one-way shoulder screws are constructed of steel and come in a chrome plated finish. They feature a tamper-proof head which prevents them from being loosened or removed once installed. These fasteners are manufactured with #10-24 threads and have a reach of 1-3/16 inches, with a 1/4 in. outside diameter shoulder, and a 7/16 in. head diameter. One-way screws like these are commonly used with one-way barrel nuts in commercial restroom applications. Installation of these types of security fasteners requires only the use of a (flat head) slotted screwdriver, while the removal of these fasteners requires a one-way screw remover tool.