The Irwin Multi&45; Cut Professional circular saw blade is extra robust for hardwood&44; aluminium & even nails in wood&46; It has a hard body&44; with blade hardness of 39 &45; 45 HRC&46; The blade is FLT Tooth Design &40; Flat Top&41; with a &45;1&38;deg&59; &38;&35;8211&59; 4&38;deg&59; cutting angle & has an anti kick back shoulder design for safer & more comfortable sawing&46; Expansion slots help keep the blade flat & dissipate heat to reduce warping&46; It is anti&45;rust treated &40;lacquered&41; & has K20 cabide tips&46; Bore diameter&58; 30mm &40;16 &38;amp&59; 20 reduction rings supplied&41;&46; Saw diameter&58; 184mm&46; Number of teeth&58; 30&46;