Arbortech Contour Sander True random orbit action Supplied with 50mm self-stick discs Suitable for 100mm(4\") and 115mm(4.1/2\") angle grinders Adaptor nut (M10 to M14) included Excellent control and balance Outstanding for free-formed convex and concave shapes The Arbortech Contour Sander is solidly made, ingeniously designed and precision engineered. It uses an innovative new design resulting in a true random orbit action that is only evident when the disc is applied to the work. It gives an excellent finish free of sanding marks and won't leave the friction burns that a spinning pad is prone to do. The sander is designed to fit a 100 or 110mm portable angle grinder but will not fit the Arbortech Mini-Grinder. The Contour Sander is remarkably effective, rapidly abrading material to give a very good finish, even with the coarsest grades. Owing to the very flexible outer rim of the sanding disk, where most of the sanding takes place, it does an excellent job of sanding curved surfaces. In addition, the unique design means that vibration from the grinder is minimal. Includes: Random Sander Attachment,1 x backing pad, 7 x 80g sanding discs, 6 x 120g discs, 6 x 180 discs, 6 x 240g discs, M10 - M14 Adaptor.