Amana Tool 45950, Core Box (Round Nose) Carbide Tip bit with Top Mount Ball Bearing Guide, 3 Flute, 1/4 Shank, D - 1/2, h - 3/8, R - 1/4, d - 1/4, L - 2
Yonico 14360q 3 Bit Core Box Long Reach Router Bit Set, 1/4-Inch Shank : Amazon.ca: Tools & Home Improvement
Yonico 1 in. Dia Carbide Tipped Core Box 1/4 in. Shank Router Bit 19105q