This is a unused Atlas Copco mini pneumatic reversible Hi Lok runner. It will install 5/32" Hi Loks. The socket size is 5/16" and the hex key size is 1/16". The socket and key can be replaced if you want to switch to a larger collar. The head can swivel and lock 360 degrees. This tool was purchased directly from a authorized Jiffy Tool distributor where the tool was maintained as part of a Boeing tool leasing program.