Made from a combination of high grade German steel and Ceratizitcarbide, the WoodRiver8" Box Joint Blade Set delivers a superior cut on an edge that will stay sharper longer than other blades on the market. Install the two blades back-to-back or face-to-face for perfectly flat and square box joint cuts 1/4" or 3/8" wide. 8" diameter, 5/8" bore, 20T Flat Top Grind, 1/4" and 3/8" Kerf, 18 degree hook angle, German steel, Premium grade Ceratizitcarbide tipsAbout Us: Founded in Boston in 1928, Woodcraft's operations were moved to Parkersburg, West Virginia in 1989. It's been over 90 years since Woodcraft first began selling high quality woodworking tools and supplies out of a one room shop in Boston's North End, and Woodcraft is still firmly committed to providing woodworkers with superior products and expert advice. We are America’s leading supplier of saws, hand planes, power tools, hand tools, wood stain and finishes, routers, sanding supplies, wood, wood turning project kits, dust collection, and wood carving tools. We also offer a wide selection of woodworking plans, books and videos. Our family of brands includes WoodRiver, Highpoint, Woodcraft, Pinnacle and Woodcraft Magazine.