High performance bi-metal holesaws with a variable tooth design and a positive 10° tooth angle, providing faster and more aggressive cutting. Improved heat dispersion during cutting ensures that the teeth stay sharper for longer. Matrix II premium high speed steel, containing 8% cobalt is used for the teeth, allowing them to retain the original hardness even at high working temperatures. The backplates are constructed with thick steel, thus the holes will not enlarge over time. Thick backs add strength and rigidity, minimising vibrations. Multiple leverage points to work cut material out of the holesaw for faster plug removal. Cuts Wood, Metal & Plastic Steel Slotted Barrel for Better View & Plug Ejection 19mm - 32mm Dia. Holesaws Fits Any Chuck 10mm or Larger Plugjack Leverage Points Cuts Wood, Metal & Plastic Steel Slotted Barrel for Better View & Plug Ejection 19mm - 32mm Dia. Holesaws Fits Any Chuck 10mm or Larger Plugjack Leverage Points