4-12mm Triangular Shank Spiral Flute Step Drill Bit, 4-12mm, 4-20mm, 4-32mm, 6-30mm, 3 In 1

1. No pilot hole required
2. The big drill has 3 side handles
3. Automatically support the hole when drilling
4. High-speed steel, sturdy and durable
5. Widely used to cut holes in various materials such as steel, wood, thin iron, aluminum alloy, insulating board, PVC board, etc.
6. Specifications:
(1) 4-32mm (4,6,8,10,12,14,16,18,20,22,24,26,28,30,32 mm) 10mm shank
(2) 6-30mm (6,8,10,12,14,16,18,20,22,24,26,28,30mm) 10mm handle
(3) 4-20mm (4,6,8,10,12,14,16,18,20 mm) 8mm handle
(4) 4-12mm (4, 6, 8, 10, 12 mm) 6mm shank

Packing list:
The 3-piece set contains:
4-12mm x 1
4-20mm x 1
4-32mm x 1