This pack of 100 4 Prong T-Nut from Squirrel Products offers pronged tee nuts (also known as T-nuts and pronged nuts for wood) that can be used for an assortment of indoor and outdoor applications, including: Rebuilding and Mounting Equipment Knock Down Furniture Wood working Projects And other do it yourself installs. These T-nuts have a flange at 1 end with 4 prongs extended to hold it flush and locked in, preventing problematic rotation during assembly. Whether you're working with soft wood, hard wood, plastic or particle boards these steel zinc plated inserts feature internally threaded bodies that provide secure and reliable holds for all work pieces involved.