Yous Auto 15 Sizes Triangle Shank Step Drill Bit 4-32mm High Speed Steel Spiral Step Drill Bits Sheet Metal Hole Drilling Cutting Tool HSS

Detailed description: Material: High speed steel Size: 4-12mm: 4-6-8-10-12mm 5 steps 4-20mm: 4-6-8-10-12-14-16-18-20mm 9 steps 4-32mm: 4-6-8-10-12-14-16-18-20-22-24-26-28-30-32mm 15 steps Type: Spiral step drill Handle: triangle Scope: thin iron plate aluminum plate insulation plate PVC plate internal wood thickness is 0.4mm. Note: We have different types of products you can choose which one you need Parts List: 1 drill bit