ROHN WM12S Wall Mount with12" Stand Off - For Masts 7/8" to 2-3/4" OD (R-WM12S) HEAVY DUTY SINGLE 'Y' STYLE BRACKET GALVANIZED STEEL WALL MOUNT PROVIDES 12" CLEARANCE TO THE WALL. MASTS ARE HELD IN PLACE WITH A UNIQUE 'ANTI-TWIST' LOCKING SCREW. CLAMP ACCEPTS 7/8" TO 2-3/4" OD MAST TUBES. CAN BE USED ON MASONRY, WOOD, METAL, OR OTHER TYPES OF WALLS USING UP TO 1/4" LAG SCREWS OR BOLTS (NOT INCLUDED)