Micro machine screws are tamperproof screws that are very small in diameter and ideal for small instruments or electronics that require high security. KEY-REX® screws are manufactured out of stainless or alloy steel for the toughness required in high security applications. Since each KEY-REX® socket is custom designed, it is easy to custom other features such as head diameter and threads to fulfill specific high security needs. Micro tamper-resistant screws (in any style) are not usually stock items and must be special ordered. KEY-REX® screws do not require big minimums for special orders, and thus are the most economical as well as the most secure tamperproof fasteners available.