49529. Carbide Tipped Corner Round 3D 1-7/16 Dia x 1/4 Radius x 13/32 x 1/2 Inch Shank. 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.