Allen screws are screws characterized by its head having a hexagonal socket. Allen or hex socket is the primary drive used and is to be torqued using an Allen wrench, also called a hex key. Allen socket screws are often seen as advantageous over the normal Philip’s head. Allen screw head has six pressure points while the other one has only four. With more pressure points, it is easier to grip the screw making Allen screws preferable. Set screws are also known as blind screws which are a type of screw usually for attaching and securing an object against another object. The most common example of application of set screws is securing a pulley or gear to a shaft. When considering registering the gear, collar, or any similar disc-shaped object to a part of the shaft, a flat can be machined into the shaft, then the end of the set screw is pressed against to secure it. Socket set screws are especially designed for preventing movement of a pulley or any similar machine part relative to a shaft. Stainless steel screw and sockets would often offer incredible advantages over screws and sockets made with ordinary materials. Its advantages include being resistant to corrosion and it requires low maintenance among the others. It might cost a little more than the ordinary materials, but it has a lasting value.