This Base Plate can be used to mount any house with bottom dimensions larger than 6"" x 5"", It allows you to mount wooden purple martin houses safely and securely when used with the Heath 15" Telescoping Pole (sold separately), Fits 1, 25"" Diameter pole, Comes with 4 pre-drilled holes and 4 wood screws, Dimensions: 5, 75"" L x 4, 38"" W x 2"" H, Satisfaction ensured, Manufactured to the highest quality available, SKU: GC2410