5pcs/lot Metric Single Flute Countersink Drill Bit Set High Carbon Steel Titanium Coated Wood Chamfering Cutter Tool Bits - AliExpress
STERLING GUN DRILL Solid Carbide Single Flute 7/32" X 10" GA021871000 USA .2187 | eBay
Made in USA 3/8", 6" Flute Length, 7" Depth of Cut, Carbide-Tipped Shank, Single Flute Gun Drill - Walmart.com
TITAN USA TC19704 | Mallory Safety and Supply
Made in USA - Straight Single-Flute Drill Bit: 7/16″ Dia, 115 ° Point, Carbide - 08535031 - MSC Industrial Supply
ZCC Single Flute coated/polished, € 42,95
82 Degree Single Flute Countersink Set of 4-82 Degree Point Angle - 1/4", 3/8", 1/2", and 3/4" Diameter Countersinks, LittleMachineShop.com (4540) - Amazon.com