3pcs Angle Grinder Extension Rods in 75mm, 100mm and 140mm length; Threaded Hole: 14mm. Super Extension: Each extension rod snaps together easily without tools and can extend up to 259mm to maximize length. High Compatibility: The M14 rotary polisher extension rod easily screws onto any rotary polisher, angle grinder or accessory with an M14 thread. Also works with M14 backing plates. Widely Used: Grinder connecting rod used for deep stone grinding and polishing. Can be matched with other tools, such as grinding wheels, grinding head types and grinding discs. Suitable for grinding and polishing deeper stones with inner corners and special shapes.