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.