Package included in: 1 x Supercraft Rubber Backing Disc 125mm 1/4" Arbor and fitting Specifications: Rubber sanding discs provide maximum cushioning for abrasive sanding or polishing discs and are useful where sanding or polishing at high speeds is required. The rubber disc must be mounted onto an electric power drill by inserting the arbor into the drill chuck. The specially contoured backing disc is supplied with a 1/4" arbor, securing plate and fixing screw and suits all electric power drills.