KWB Mehrkranzlochsäge, 7-piece battery top, silver, 498720 (tool)
This review is from "KWB Mehrkranzlochsäge (7 pieces)," ASIN = B00JKLWKZS Hole saws are very practical tools to drill circular holes in wooden boards, etc.. Seven Sägezahnkränze with common diameters (46 mm to 97 mm) are available with this mode