6pcs USSR HSS Combined Center Drill Bits Set

You are bidding on a complete set of 6 vintage Soviet-era combined center drill bits (Type A, 60° countersink angle). Made in the USSR from legendary high-quality High-Speed Steel (HSS / Russian grade R6M5). True industrial New Old Stock (NOS) items from state reserve storage. These double-ended center drills are essential for creating accurate starting/center holes on lathe machines. Full set specifications (Pilot Drill Diameter x Body Shank Diameter): - 2.0 mm (Shank: 5.0 mm) - 2.5 mm (Shank: 6.3 mm) - 3.15 mm (Shank: 11.0 mm) - 4.0 mm (Shank: 14.0 mm) - 5.0 mm (Shank: 12.5 mm) - 6.3 mm (Shank: 20.0 mm) Standard: GOST 14952-75 (DIN 333 equivalent) Material: Premium Soviet HSS (R6M5) Condition: New old stock (NOS). Excellent vintage condition. Wrapped in protective factory grease and paper. May show minor surface cosmetic shelf wear due to age, but never used and 100% fully functional. Perfect for metalworking, toolmakers, engineering, and professional lathe operations.