Amazon.com: Bosch Professional 1x Hole Saw HSS Bi-metal for standard adapter (for various materials, Ø 105 mm, Accessory Rotary Drill) : Tools & Home Improvement
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Bosch HSS Bi-Metal Holesaw 102mm Diameter
NEW BOSCH HSS BI METAL 14mm (5/16") STANDARD ADAPTER HOLESAW 2608564100879 | eBay