Stairtrends Newel Mounting Plate & Screws is specially designed to fit square newel posts measuring between 3 and 3-1/2 inches wide. This versatile mounting plate allows for easy installation of posts under carpet, over concrete, or on finished floors, making it suitable for a variety of flooring types. The kit includes both the mounting plate and the necessary screws for secure attachment, though trim is not included. This product a reliable and straightforward solution for mounting newel posts with confidence and durability. Model Number: SNMP4