[Taper Spindle Adapter Size]: The total length of the threaded taper spindle adapter is 88mm, the threaded part is 55mm, and the inner hole diameter is 8mm. This taper spindle adapter kit is suitable for shafts with a diameter of less than 8mm. Please purchase according to the size to avoid the machine not suitable for you. [Installation]: Install the spindle adapter on the bench buffer machine and tighten the two screws with a small wrench. Align the center hole of the polishing wheel with the tip of the shaft, push and turn the polishing clamp wheel. 1 pair of adapters are provided which can be assembled on both sides of the bench grinder. [Application]: Taper spindle adapter is installed on mini bench pads, small bench grinder. Can be connected with cloth polishing wheel, fiber wheel, wool wheel. 3 inch, 6 inch, 8 inch polishing wheel for bench grinder.[Bench Grinder Spindle Extension]: Used to convert your bench grinder into a bench polisher using of these bench spindles, and they are held in place by grub screws. [Material]: The threaded taper spindle adapter is made of sturdy steel, durable and long service life. Polishing wheel for bench grinder with left and right adapter.Size: refer to the size picture