EZ 32A Heavy Duty Ground Mount for Telescopic / Push Up Masts - Mast Plate UNIQUE DESIGN FEATURES WELDED GUIDE PIPE FEATURES INSIDE DIAMETER OF 2-1/4" . EXTRA STURDY DESIGN. MAST IS HELD SECURELY IN PLACE WITH SET SCREW. THE PIN PROVIDED ALLOWS PLATE TO BE CEMETED INTO A CONCRETE PAD. PLATE IS 11 GAUGE STEEL x 9" x 9" ABSOLUTE MAXIMUM OUTSIDE DIAMETER THIS WILL ACCEPT IS 2.250". DESIGNED TO SUPPORT EASY UP, ROHN, ETC TELESCOPIC PUSH-UP MASTS AND OTHER MASTS WITH UP TO 2-1/4" OUTSIDE DIAMETER (Not compatible with Channel Master 1850 40' Mast)