Nkk 60184988 Flap Discs (No.40), 4 Inches. 

Used for storing workpieces, rusting, removing, believing or cleaning the surface to be smooth Whether it is woodwork, metal work such as steel, aluminum, stainless steel, brass tin, ceramic and marble plastic work 

• Suitable for polishing general metal, wood, furniture
• Helps increase the efficiency of polishing work because it has consistent sharpness
• Used for polishing rough work that requires polishing, adjusting the surface, removing welding marks
• Made from premium grade aluminum oxide sand and Korean KMCA cloth for durable use
• Can be used with electric grinders
• High flexibility, grinding work, polishing smooth surfaces that can be pressed to the fullest
• Fast polishing, firmly attached with special glue, no problem of broken cloth, glue falling off and has a long service life
• Hard-backed sanding disc, heat-resistant and good heat dissipation
• Hard-backed sanding disc, No. 40
• Size 4 inches.