57268 Carbide Tipped Undermount Bowl Solid Surface 2-3/16 Dia x 63/64 x 14 Deg x 1/2 Inch Shank
This bit has a 14 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 1410-VO, 1613-UVO, 1914-VO, 2114-VO
Livingstone Vanitiy # V130-G
Wilsonart® Vanity #'s BV1410, BV1613
Formica Vanity #'s L075, L100
Avonite Vanity #'s VS-1815, VS2015
They trim and profile the counter-top edges after the bowl is mounted.