Browsing the FAMAG Catalog I came across this unusually deep set of hole saws. These hole saws were designed for drilling holes up to 300 mm (almost 12″) deep! If you have a problem ejecting the plug from a regular “short” hole saw, how are you ever going to get a 10″ plug out of one these extended hole saws?
FAMAG manufactures these bi-metal hole saws with a variable tooth pitch. To form the cutting head they weld high-speed steel teeth onto the cylindrical carrier. They sell the hole saws in 86 mm, 111 mm, 130 mm, 152 mm, 170 mm, 200 mm diameters which range from approximately 3-3/8″ to 7-7/8″.
You’ll drop anywhere from 175 to 425 Euros ($250 to $600) depending on which size you order. That’s not including the center spike which FAMAG sells separately for an extra 60 Euros ($85).