Main Body: 2 1/2 “ x 6 3/8“, Plate: 1 1/8“ x 6 3/8” Hole Diameter: 1” Conforms to UL STD 2239, Certified to CSA STD C22.2 No. 18.4, Accepted by IEAI Follows the same guidelines as typical wire fill calculation Leaves room for future expansion Maximum distance between each Cable Chase Wire Bracket under floor joists is 16″ (when using under floor joists, the maximum distance, on one side from any wall, joist, pipe or ductwork is 12″) Maximum distance between each Cable Chase Wire Bracket along floor joists is 30″ Maximum distance between each Cable Chase Wire Bracket above ceiling joists is 24″ Wire fill per hole: No more than (3) of 14-2, 14-3, 12-2, 12-3 romex. No more than (2) of 10-2, 10-3, 8-2, 6-2 romex. No more than (1) of 8-3, 6-3 romex and any SER up to #2. Unlimited low voltage, data, phone, cable