①: Warning----This is Metal Work Blade, Never Use This for Cutting Wood ②:5⅜"(136mm)-30T MTCG Tooth. Arbor 20mm with 5/8" and 10mm Washer. ③ Ultra Thin Kerf 0.06"(1.5mm) ④: Metal Work Circuar Saw Blade. Use for Iron*Aluminum Bar. Sheet, Angle ⑤: Ultra Thin and Light Design, Especially Good for Corldless Saw