This UHPPOTE Flexible Armored Door Loop Wire Protector with Alloy Ends is 16" long and has a 1/2" OD. It is made of stainless steel with a thickened ripple tube and painted with high temperature. It is suitable for preventing malicious damage to the wire and is ideal for use with access control, electric locks, magnetic contacts, and alarm buttons. It is easy to install and provides a secure and attractive solution.