The T-Nut Hammer Head Fasten 5mm (20 PCS) For 40x40 Aluminum Profile is a product that can help you build or modify your aluminum frame structures. The T-nuts are made of nickel-plated carbon steel, which has good rust and oxidation resistance, high hardness, and durability. The T-nuts have a hammer head shape, which means they have a flat top and two protruding sides. The hammer head shape allows the T-nuts to slide into the T-slot or V-slot of the 40x40 aluminum profile from any position. The T-nuts have a 5mm thread size, which means they can fit M5 screws or bolts. The T-nuts can be used to fasten brackets, plates, wheels, sensors, or other parts or accessories to the aluminum profile. The T-nuts are easy to install and adjust, and they can provide a strong and stable connection. The pack contains 20 T-nuts, which is enough for