Fits most 150mm random orbital sanders, fits Bosch sanders. For GEX 150, GEX 150 AC, GEX 150. Adds backing to disc for better abrasive cutting and closer edge sanding. Hole pattern helps eliminate dust from the work surface, increasing the life of the disc. Self-fixing hook. Effortlessly snaps between sanding discs and spare pads for quick changeover. Velcro closure. Increases disc grip for better sanding and tighter edge sanding. Can be easily clamped between sanding discs and backing pads for changes fast. Hole pattern helps remove dust from work surface and increases disc life. Hook-and-loop hook. Adds support to the disc for better abrasive cutting and closer edge sanding. Applies effortlessly between sanding discs and back-up pads for quick changeover. Hole pattern helps remove dust from surface work, increasing the life of the disc. Specifications: Color: black. Diameter: about 150 mm. Thickness: about 15.6 mm. Thread diameter: about 8 mm. Thread length: about 25 mm. Number of holes: 6 holes. Mounting thread: M8. Quantity delivered: 1 piece