Three super-strong 5-inch Magnets make up this MFJ Goliath Tri-Magnet Mount. MFJ-336 has three super strong 5-inch magnets bolted to a 1/4 inch triangular mount. 17 feet of coaxial line is terminated with a PL-259 connector. Caution: once
on, it's difficult to get it back off! With 3/8 x 24 thread connector.