You can purchase the Handle/Base Unit complete with one of the Interchangeable Heads, then add different Heads, only as your needs grow - all for a far, far lower investment than ten, individual, specialty wrenches. Base/Handle Unit can be used as a replacement or as a part of your own custom, action wrench or system. Mfg: Brownells SPECS: Blued steel. Base/Handle Unit - 12 3/4'''' (31.1cm) long, 1'''' (24.5mm) diameter.