Abrasive Cup Brush: 4Inch nylon abrasive cup brush 2 pack, consists of heat , nylon bristles, impregnated with abrasive grains. Cup shape design specializing in larger uneven surfaces. Great for working edge of live edge boards. Effective And Safe: Abrasive brushes create less damage, almost not shed bristles, maintains shape, and not corrode or rust as to using a wire brush. Nylon based abrasives 't cause and can be used in a wet or dry environment. Rough Up Paint: Abrasive cup brush is great for rough up the paint in a truck bed for a in liner. It can strip old paint off with ease and prep surfaces for bed liner. Nylon abrasive is soft enough not to damage metal parts but strong enough to clean them and easy for the uneven and corner. Max 8500 RPM: Fit for a variable speed 5/8Inch-11 Thread angle grinder, polisher and 1/4Inch(6mm) electric drill. Our abrasive brush is suggest to use at a lower speed. Protect the bristles from high speed to bend out and hard to control. Wide Applications: Great for less aggressive abrasive needs, for delicate objects cleaning or softer material refinish jobs. Remove rust, sanding the dirt, stripping flaking paint, Cleaning glue, sealant etc Color:Red & Silver Material:Nylon Package Contents: 2 * Abrasive Bristle Cup Brush Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.