Dottie Fully threaded wedge anchor features zinc-plated finish for longer endurance. It measures 1/4-Inch x 2-1/4-Inch. UNC nut has thread size of 1/4-20-Inch and thread length of 1-1/4-Inch. It has 1/4-Inch drill size and 1/2-Inch x 3-3/4-Inch screw size.