5pcs aluminum box ladder drill set / bench drill / pagoda drill / high speed steel bit

Name British staircase 5PC
Material: high speed steel 4241: suitable for use below 25 degree, such as carbon steel, iron plate, steel plate.
Surface treatment: Yellow + Black

Packing:

5PC British ladder drill aluminum box: 500 g / set (package size: 160*120*48mm)
5PC British ladder drill OPP Pack: 340 g / set (package size: 120*80*35mm)
Ladder drill 3/16-1/2”(3/16, 1/4, 5/16, 3/8, 7/16, 1/2)
Ladder drill 1/8-1/2”(1/8,5/32,7/32,1/4,9/32,5/16,11/32,3/8,13/32,7/16,15/32,1/2)
Ladder drill 1/4-3/4”(1/4,5/16,3/8,7/16,1/2,9/16,5/8,11/16,3/4)
Ladder drill 3/16-7/8”(3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 3/4, 11/16)
Ladder drill 1/4-1-3/8”(1/4, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8)