Designed for grinding angles of 20-25 degrees, the DEWALT 120g Type 29 High Performance Flap Disc quickly removes material with aggressive grinding action. Featuring zirconia grit, which removes material 3 times fast than fiber resin metal sanding discs, each flap disc is packed with a premium abrasive cloth that lasts 15 times long than fiber resin metal sanding discs. The type 29 fiberglass backing provides optimal grinding angle of 10-25 degrees, allows full use of the flap disc, and won't mar the work piece. Applications of the flap disc include weld blending, removing weld slag, debarring, surface finishing and preparation, edge blending and chamfering. Get the job done right with this durable flap disc!