This steel strut with a cold drawn steel base is designed for durability and reliability. The fixed arm height is 6.9" and the extension arm length is 6.3", with a magnetic base dimension of 2.30" L x 1.98" W x 2.18" H. It holds an 8mm stem and lug back with a holding power of 135lbs. The magnetic bracket features a switchable permanent magnet, making it easy to install on metal surfaces, and the V-groove base allows for easy installation on cylindrical parts. The universal knob includes a flexible, strong, and precise rotary joint that can adjust the support rod to any direction and fix it firmly. This product is ideal for maintaining the position of a dial indicator or test indicator during measurement operations.