Dremel Flapwheels Perfect for sanding flat or contoured surfaces on metal,wood, rubber or plastic. Technical specifications for 502 Shank diameter: 3.2 mm Working diameter: 28.6 mm Working height: 9.5 mm Grit: 80 Maximum speed: 35,000 rpm Quantity: 1 Order number: 2615050232 Technical specifications for 504 Shank diameter: 3.2 mm Working diameter: 28.6 mm Working height: 4.8 mm Grit: 80 Maximum speed: 35,000 rpm Quantity: 1 Order number: 2615050432