Faster than our Constant Pitch hole saw;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.;New 5.5 TPI / 25mm tooth form provides a smoother, faster cut in all materials.;Hole saw depth 41mm (1.5/8)The L. S. Starrett Company Ltd