Interleaf flap wheels are constructed with alternating flaps of surface conditioning material and coated abrasives material for a high cut rate and a uniform scratch pattern.Provides blending action while leaving final finish on work piece.Smear-resistant non-woven material for clean, smear-proof work surfaces.Interleaf design makes product more aggressive than SAIT non-woven flap brushes and less aggressive than SAIT coated abrasive flap wheels.Available in two grades: Medium and Very Fine., Medium (General Purpose): Excellent for removing heavy oxidation, blending, cleaning, and deburring. Medium surface conditioning material with either 60 or 80 grit coated abrasive material.Very Fine: Excellent for grain finishing, satin finishing, and linear scratch patterns. Very Fine surface conditioning material with either 120 or 180 grit coated abrasive material.