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【High Material 】 The hole saw arbor is made of high quality HSS carbon steel & Bi-metal steel with sharp edges and high hardness. strong and sturdy.The precision of the concentric degree, so that the teeth edge of the uniform, to extend the life of the hole. 【Cutting Design 】 The metal 53mm hole cutter with the non-binding clean edge design, this hole saw cuts smooth and easy. And the spring on the drill bit would automatically pushes the disc out of the saw immediately after completing the hole. 【Sharp Tooth】 The holesaw 53mm high-speed steel cutting edge provides shock resistant teeth and resists tooth strippage.The tooth shape is sharp, the vibration is small, and it can be quickly balanced when opening the hole, making the operation more stable. 【Easy Chip Removal】Newly designed chip removal groove,hole saw sets can discharge the chip rapidly,improved the speed of removing the cylindrical iron filings in the hole and will not cause the crack and stuck piece phenomenon. 【Wide Application 】The hole cutting set suitable for cut Mild Steel, Stainless Steel, Cast Iron, Brass, Aluminium, Wood etc.,Perfect for Installing Locks, Knobs in Doors and Cabinets or Drilling Larger Diameter Holes Through Desks etc.,Carpentry decoration essential tool.