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FEATURES: Positive rake teeth provides better chip clearance 1 1/2" cutting depth will cut through a 2 x 4 Requires a separate arbor. Variable pitch teeth reduces friction and heat Expanded gullets allow for faster cutting and increased blade life Better tooth match for better chip clearance and smoother cutting Reinforced tooth flank makes teeth stronger for longer life and resistance to tooth strippage. Applications: Wood, plastic, machinable metals, stainless steel alloys, nail-embedded woodPremium line of professional quality bi-metal hole saws feature an M3 high-speed steel cutting edge, electron beam welded to a tough steel backer. Caps stand up to abuse and punishment, yet are lighter and easier to use than those of competitors. Cutting depth is 1-1/2" (38mm). Arbor required.