A set screw or grub screw is a type of screw generally used to secure an object within or against another object. The most common examples are securing a pulley or gear to a shaft. Set screws are usually headless (also called blind), meaning that the screw is fully threaded and has no head projecting past the major diameter of the screw thread.

Knurl point screws are generally used to secure one object within another. The serrated ridge on the knurl cup set screw helps reduce loosening due to vibration. The knurled point combines digging action of the cup point with counter-clockwise locking knurls that have a ratchet-locking action which helps resist loosening, even under the most severe vibrations.

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