Brackets can accommodate masts up to 2-1/2" outer diameter,14 inch from wall. Great to mount a mast against buildings/houses.Perfect for outdoor TV antenna & dish installations and poles against wall. Heavy-duty Stand off wall mast mount clamps are made of 0.2inch thick galvanized steel,strong enough to bear heavy antenna masts. Kit includes: 1 pair(3-leg and 2-leg mount braces), including U-Bolt ,V-Block Brackets ,M12*100mm expansion bolts for reliable mount.