The ZN-9RZ with 3/8" OTO is built on a 3 1/4" diameter base X 15/16" thick and weighs 2.5 pounds. It features 3 ball bearing per lever arm, magnetic return, solid silver contact points and very fine threaded magnet and contact screws (56 TPI). It has 6 non-skid feet for maximum stability. All screws are stainless steel. OTO of this ZN-9RZ is 3/8".
Available powder coated colors are shown: HERE