3PCS Spiral Grooved Step Drill Bit Set Cone Drill Bit Metal Hole Cutter

Specification: Type: Spiral Step Drill Bit Material: High Speed Steel Coated: Nitride Coated Handle: Triangle Scop: Thin iron plate,aluminum,insulation panels,PVC panels 0.4mm thickness within the timber. 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 Package Included: 3Pcs Step drill bits set.

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