3PCS/SET 4-32MM HSS Cobalt High Speed Steel Spiral Step Drill Bit Set Nitrogen For Metal Cone Triangle Shank Hole Metal drills
Specifical step design, one drill for many sizes, very convenient.
Cutting material: iron sheet, aluminum, insulation board, PVC plate wood thickness in 4mm.The hole with a drill can play a variety of.
1x 4-12mm drill
1x 4-20mm drill
1x 4-32mm drill