Preamer Flexible Drill Shaft Extension Keyless Chuck fit Dremel Fit Dremel 100 200 300 4000 7300 7700 This flexible shaft can extend the electric grinder & drill to engrave, polish, and mill. It can turn unwieldy electric grinding into deft manual grinding. Using a flexible drive enables you to take your power tool to the most inaccessible places. It may be used with polishing kits, drill bits, wire brushes, countersinks, flap wheels, mounted stones and grinding wheels. Slotted Nut Model: M18-M19 Work with the Dremel 100, 200, 300, 4000, 7300, 7700; Foredom, ToolShop; Performax; Milwaukee M12