Pulse / Larsen NMOHFUD NMO style mounts convert from low frequency applications to high frequency applications and back by pulling or replacing the center pin and insulator. NMOKHFUD mounts has a 3/4" hole for mounting and include 17' of RG-58U dual shield coaxial cable with no connector. These mounts accommodate roof surfaces from 0.1" to .03". Use NMOHFTHK (thick) surface mounts for roofs up to 1/2" thick.