Lot of Vintage high Speed Drill Bits- 1 x 21 Union Twist Drill Co.- 5564 x 15 Double Circle- 2932 x 6 Union Twist Drill Co.- 78 x 6 IM USA- 2932 x 7 National Detriot- 5164 x 13 unknown- 78 x 12 Union Twist Drill Co.- 58 x 19 Standard- 5164 x 13 Standard