57269 Carbide Tipped Undermount Bowl Solid Surface 2-7/32 Dia x 63/64 x 18 Deg x 1/2 Inch Shank
This bit has a 18 degree cutting draft with a bearing that matches, enabling the cutter to do more work so you have to do less and is designed specifically for use in undermount installations of:
Gemstone Vanity #'s 1512-VO, 1610-VO, 1612-VO, 1713-V, 1319-VFO, 1321-VO, 2213-VO (Baby Bath), 1311-S
Wilsonart® Vanity #'s BV1612, BV1512, BV2213
Formica Vanity # L065
They trim and profile the counter-top edges after the bowl is mounted.