This is no ordinary corner Rounding bit! A guide ring on the bit perimeter coupled with a guide bearing above the profile allows you to round the edges of stock that curves in two planes. Just what's needed for shaping chairs or any furniture that has compound curves., #49529 diameter (D) 1-1/4, Radius (r) 15/64, cutting Height (B) 1/4, shank (D) 1/2, overall length (L) 3-27/32, replacement bearing 47706, 47721, replacement aluminum ring 47792, 49529 carbide Tipped corner round 3D 1-1/4 dia x 15/64 radius x 1/4 x 1/2 inch Shank