Designed for use with an angle grinder, these holders have a 5/8 x 11 female thread to attach to most popular angle grinders. If you want to remove a lot of wood safely and in a hurry - this is your tool. Also great used in conjunction with carving operations, or with other wood carving type discs to get your desired effects. Make sure to use a respirator when using this because it will make a dust cloud in a hurry.