Material: HSS Steel. 1 Pcs x 4-32mm Step Cone Drill. 1 Pcs x 4-20mm Step Cone Drill. 1 Pcs x 4-12mm Step Cone Drill. With the Titanium coated to reduce friction and heat. Ideal for using to cut holes in a variety of materials including steel, brass, wood, plastic,copper, fibreglass and PVC etc.
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