Firestik MU-8R18 EZ-Install 18' CB Radio Antenna Coax W/K-4R Stud Mount MU-8R18 can be routed from the mount to the radio through a hole size of 7/16". Once you reach the radio just screw on UHF / PL-259 adapter. No soldering needed and no tools needed Stranded center conductor to maximize flexibility and prevent untimely breakage Shielding coverage that averages 95% to protect against RF leaks and interferrence K-4R used with Firestik Fire-Ring coax cables 3/8 X 24 - 1 1/2" Stainless Bolt. Nylon Washer. 3/8 X 24 Nut