Flush trim bit with ball bearing guide. 3/8" diameter, 1/2" carbide height, 1/4" shank.
Amana Tool 47102 D: 3/8" B: 1/2" d: 1/4" L: 2-1/8" 1/4" diameter for closer inside corner cutting. Bearings not guaranteed due to size. Super clean cuts as well as Cost effective.