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Specifications Material: Aluminium Alloy Color: Black Adjustable Gripping Diameter: 0.2-3.4mm (1/64--9/64 inch) Overall Length: 90mm The 10 pcs Twist Drill Bits Diameter: 0.6, 0.7, 0.8, 0.9, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0mm (0.024, 0.028, 0.031, 0.035, 0.039, 0.047, 0.055, 0.063, 0.071, 0.079 inch) Application: It's mainly used for the materials of Wood, Resin, Jewelry, Walnut, Amber, Beeswax, Olive Nut, Vajra Bodhi, Buddha Beads, Ivory Nut, PVC, Acrylic and Plastic etc.