Fast Cut Bi-Metal Hole Saws contain an extra cobalt HSS tooth material for enhanced heat and wear resistance, along with a new 5.5 TPI positive rake tooth design, to ensure a smoother and faster cut when compared against our previous Constant Pitch Hole Saw. Specifically designed to cut stainless steel, metals and mild steel sheet, Fast Cut Saws will also cut through wood, plastic, plaster and other materials. Recommended cutting depth - up to 13mm (1/2”) in softer materials.Teeth per Inch (25mm): 5,5Teeth Type: Extra Cobalt HSSCountry of Origin: BR Specifications Diameter metric: 73mm Diameter imperial: 2,7/8" Cutting Depth metric: 41mm Cutting Depth imperial: 1,5/8" Thread Size: 5/8 - 18" Features and Benefits • New tooth material for enhanced heat and wear resistance and greater product life. • Ideal for stainless and mild steel sheet and tubes with wall thickness of up to 3mm (1/8”). • New 5.5 TPI / 25mm tooth form provides a smoother, faster cut in all materials. • 41mm (1.5/8")