1. Widely applicable, perfect for polished metal, wood, jade and so on. 2. Polishing stick plate supporting the use, easy and simple to use. 3. Sanding coated with aluminium oxide bound with synthetic resin are the perfect choice for working of all wood, woodbased materials, and metal, from coarse sanding to fine sanding. 4. 40-60 grain are used for coarse sanding of rough surfaces, 80-120 grain are suitable for surface smoothening and sanding of small roughnesses, 120-240 grain are good for final fine sanding. Type: Sanding Disc Material: Aluminum Oxide Diameter: . 125mm/ 5 inch Color: Red-brown Number of Holes: 8 Holes Model: 50pcs: 40#*10+60#*10+80#*10+120#*10+240#*10 Note: 1.Need to add sandpaper glued to the sticky adhesive disc to disc fixed polished. 2.Use an electric drill still need to add converter. Package Contents: 50* sandpaper Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.