Skywalker Non-Penetrating Roof Mount Base for Flat Roof (Mast Not Included) Use this Non-Penetrating Roof Mount Base to safety and securely install dish antennas on flat roofs where drilling holes isn’t an option. The heavy-duty steel base consists of (6) pieces of equal length which can be assembled from 35.5" x 35.5" up to 36" x 36" for a wide-set, sturdy base – the perfect size for the concrete blocks needed for ballast (not included). The (4) struts of the unit are 22.5" in length. Once placed and weighed down, simply add a mast (sold separately), and attach your antenna/dish of choice. See our selection of compatible masts: SKY32817A, SKY32817B, and SKY32817C. Skywalker offers an assortment of audio/video products and tools for quick, easy, and professional custom installations. Key Features Contains (1) Non-Penetrating Roof Mount Base for Flat Roof (Mast Not Included)Ideal for flat-roof mounting a TV Antenna or DishSafe & secure installation on flat roof surfacesHeavy-duty steel construction Base Dimensions: (6) steel pieces which can be assembled from 35.5" x 35.5" up to 36" x 36" square 4 Struts: 22.5" longHardware Included: (3) 1/4" x 3" Long Carriage Bolts (20 Threads) (D-1)(10) 1/4" x 3/4" Short Carriage Bolts (20 Threads) (D-2)(13) 1/4" Lock Washers (D-3) (13) 1/4" Nuts (20 Threads) (D-4)Works with standard grade 2 boltsRequires concrete block ballast for installation (not included)Requires mast for installation (not included)See our selection of masts: SKY32817A, SKY32817B, SKY32817CWeight: 24 poundsCollection: Skywalker Signature Series