Designed to use with an Angle Grinder they have a 5/8 x 11 female thread for attaching 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 the desired effects. Make sure you use respirator protective gear when using this because it makes a dust cloud in a hurry.