CBN Grinding Wheels are the premium wheel for sharpening tool steel (turning tools, chisels, plane irons, etc). DO NOT use for regular steel or aluminum. These wheels last a lifetime, never lose their shape like a vitrified wheel, and the wide flat surface makes sharpening much easier, especially when working with a jig. The corners is squared off, and the 9/16″ wheel rim is also coated, making an ideal flat surface for sharpening drill bits etc. They are bored at 5/8″, and include a 1/2″ adapter sleeve for grinders with a 1/2″ shaft.
These wheels ARE made of Steel, and are HEAVY. They should be used on an 1800 rpm grinder, and if using a grinder will less horsepower, they CAN be used but may require a flick with your hand to get them started.
These are well made wheels and have been tested for balance. Any adjustments required for balancing have been made (you may see a small hole in one side which is how they are balanced if required).