Medium length double socket arm has an overall length of 3.7" and a socket-to-socket length of 2.9" 1.5'' Ball double socket arm attaches to any 1.5'' C size ball mounts components, mounting bases and device holders; double ball and socket technology allows for near-infinite adjustability of your mounting system Double socket arm made of powder-coated marine-grade high-performance composite for durability and reliability in the most demanding environments 1.5'' double socket arm for Electronic Equipment/ Motorcycle/ Car/ Engineering Machine/ Tractor/ Agricultural machinery/ Forklift and More Backed by a lifetime warranty, if you have any questions about our Double Socket Arm, please contact us by email, we will help you solve it