Special featuresMakita quick-change hole saw bi-metal, 20mm diameter.The addition of a 4mm HSS-Co tooth to the HCS hole saw allows for drilling holes up to 44mm deep.The Ezychange quick-change system allows for fast and easy switching to hole saws of a different diameter.The large holes on the side also ensure efficient removal of waste materials. Technical dataDiameter: 20 mmMounting (internal): EzychangeRecommended speed for steel: 440 min-1Recommended speed for stainless steel: 220 min-1Recommended speed for aluminium: 660 min-1Recommended speed for wood: 3000 min-1Softwood/hardwood: 3 - 40 mmChipboard: 8 - 38 mmPlywood: 3 - 40 mmUnderlayment: 9 - 25 mmConcrete plywood: 4 - 30 mmSteel: 1 - 15 mmStainless steel: 1 - 5 mmAluminium: 1 - 15 mmNon-ferrous metals: 1 - 15 mmPlastic: 1 - 40 mmRecommended speed for non-ferrous metals: 580 min-1Recommended speed for plastic: 3000 min-1Hardboard: 3 mmOSB: 9 - 18 mmMaterial: HSS 8% Co [High Speed Steel & 8% Cobalt]Depth: 44 mm