ATTACHES 2 PIECES OF TUBING - 1" OD TO 2" OD ALLOWS ONE MAST TO BE MOUNTED TO AN EXISTING STURDY MAST (RADIO OR TV ANTENNA MAST, FLAG POLE, ETC) WITH A STAND OFF. STAND OFF WILL VARY DEPENDING ON DIAMETER OF EXISTING MAST. INCLUDES (4) HEAVY DUTY ALLIGATOR CLAMPS, (2) 8" THREAD RODS, & (8) FLANGE NUTS ZINC PLATED. FOR EXTRA STABILITY, PURCHASE 2 SETS