- Resin-bonded, fabric-reinforced sanding discs for long life and reliable performance. - 11 punched holes for excellent dust extraction, helping keep your workspace cleaner and extend abrasive life. - Fine, streak-free sanding on large or curved surfaces; professional quality for universal use in wood and metal. - Sanding sheets with quick and easy blade change; Velcro backing for fast sheet attachment and removal. - Material: aluminium oxide; Colour: reddish brown (as pictures show). - Size: 152105mm (approx.); Tolerance: +/- 2mm; Back technology: Velcro. - Optional grit: 40# 80# 100# 120# 150# 180# 240# 320# 400# 600# 800# 1000# 1500# 2000#. - Use and Function: 40#-240# coarse grinding for rough objects such as metal or wood; 320#-600# fine grinding for secondary sanding; 800#-2000# extra fine grinding mainly used for finishing. - Applications: wood sanding and varnish removal; metal deburring and smoothing; effective on large flat panels and curved surfaces.