Timberline 607-320 Tapered Wood Plug Cutter 1/2 D x 3/8 SHK
Max-Craft Tenon Dowel Plug Cutter Drill Bit Plug Maker Wood Cutter 1/2 inch - Walmart.com
dophee 8Pcs Wood Plug Cutter Drill Bit Set, Straight and Tapered Taper 1/4" 3/8" 1/2" 5/8" Cutting Tool Cork Drill Bit Knife for Woodworking - Amazon.com
JNB Pro Wood Countersink Drill Bit Set & Wood Plug Cutters - 2 Pc Adjustable Countersink Bit #8(7/64") #12(7/32") and 2 Wood Plug Cutters or Dowel Cutters 3/8" & 1/2" Diameter- 1