Corrugated fasteners are made of 18- to 22-gauge sheet metal with alternate ridges and grooves. One end is cut square, and the other is sharpened, with beveled edges. These fasteners are made in different lengths and widths. The width varies from 5/8 inch to 1-1/8 inches, and the length ranges from 1/4 to 3/4 inch. Corrugated fasteners are used to fasten parallel boards together. Typical uses for corrugated fasteners are in mitered corners, butt joints, and end joints. Corrugated fasteners have greater holding strength than nails in small timber. They are driven with a hammer. MCF Series Corrugated FastenersFit tools of BOSTITCH MCF16,and most 1/2" crown corrugated tools in the market.