KwikTool USA BBK450 C5 Bad Blade 4-1/2-Inch 4 Tooth With 1-Inch Arbor And 7/8-Inch, 5/8-Inch, 20mm Reduction Rings "C5 Bad Blade" 4.5" 4 tooth 1" arbor with 7/8", 5/8", and 20mm reduction rings New Patented blade concept comes from Europe where they have been usingtheseblades in angle grinders for years for working withwood . Ingenious, with specially designed toothlayout, set and reinforcement which give ourtungsten carbide blades their awesome cutting ability with NO Kick-Back Ripsand cuts and carvesall types ofwoods, laminates,plastics, fiberglassandcomposites all with NO Kick-back Functional and time savings by using your angle grinder for beam notching, utility cut-outs, trimming, cut-off and more with NO kick back!