Whiteside - 3094 Slot And Undercut Router Bit 3/4" D X 1/8" A X 1/4" B X 1-7/8" OL
Whiteside Router Bits 3098B Slot and Undercut Bit with 1-Inch Large Diameter and 1/4-Inch Cutting Length - Edge Treatment And Grooving Router Bits - Amazon.com
Whiteside Router Bits 3094B Undercut Bit with 3/4-Inch Large Diameter 1/8-Inch Cutting Length - Drill Bits - Amazon.com
1/4" x 3/16" Cutting Depth 2-Flute T-Slot Undercut Router Bit 6.35mm x 4.76mm | eBay
Southeast Tool T-Slot & Undercut Router Bits
Whiteside Router Bits 3110 Undercut Bit with 1-1/2-Inch Large Diameter and 1/4-Inch Cutting Length - Straight Router Bits - Amazon.com
Straight Shank T Type Undercut Slot Router Bit Cutter 1/2" x 5/32"|Milling Cutter| - AliExpress
Summa Router Bit for Acrylics, D6/2 L50/6 1FL UC A, 3-Pack