For sanding in grooves and on external radii. Profile sanding kit includes: (5) 80 grit, (5) 120 grit, (5) 180 grit sanding sheets and 1 holder with 6 different profile inserts (straight for profiles, V-shaped for 90 degree angles, trapezoid for tongue and groove joints, concave, convex small, and convex large). Fits most oscillating tool brands.