KwikTool USA BBST450 C7 Bad Blade Super Thin 4-1/2" 28 Tooth 1" Arbor With 7/8", 5/8", And 20mm Reduction Rings "Bad Blade C7 Super Thin" 4.5" 28 tooth 1" arbor with 7/8", 5/8", and 20mm reduction rings New introduction, this blade concept comes from Europe where they have been usingthese Tungsten carbide metal cutting blades for all types of metal cutting for years Ingenious, with specially designed toothlayout, set and reinforcement which give ourblades their awesome cutting ability with NO Kick-Back Super Thinmeans the bladehas a very thin kerf for precise control and athin path cut for all types of cutting jobs Rips thrusheet metal like a hot knife thru butter; cuts steel, iron,aluminum, copper pipe, copper sheeting, brass and other nonferrous metals cleanly and easily