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[A2 Heavy Duty Mandrel] LAIWEI 159mm Hole Saw (159mm Hole Cutter) with A2 Heavy Duty Mandrel. Fits most bi-metal hole saws 60 mm to 360 mm. 【Locking pin design】The pin locks the saw in place and prevents over-tightening and slipping. [Material] Bi-metal hole saw blade is made of high quality high-speed steel, sharp, corrosion-resistant, wear-resistant and durable. The pilot drill is made of high-quality 4341 steel, and the blade is made of high-quality M42 cobalt-containing high-speed steel, which has good workability and toughness. Features: The HSS blades of LAIWEI hole saws are electron beam welded for high cutting performance. The HSS pilot drill features a spring that pushes out chips, reducing the time and effort needed to remove chips, minimizing impact when drilling, and preventing damage to the insert and hole. Usage: can be used for drilling plasterboard, plastic, wood, plywood, thin aluminum board, etc. Suitable for electric hand drills and cordless drills. If precision is required, please use a bench drill or electric drill stand to drill holes.