The twist drill has sharp edges and corners, high drilling efficiency and very high reliability. It adopts exquisite workmanship, which makes it has smooth surface, clean drilling, high hardness, and very strong and durable. Made of high-quality high speed steel and emery, the twist drill is high-strength. There are eight specifications compatible you to choose from: 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.5mm, 3.0mm. It is suitable compatible jade, metal, agate, emeralds, gems, pearls, pendants, pebbles. Item Name: Emery Twist Drill Material: High Speed Steel,Emery Application: Drilling Tool Specification: 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.5mm, 3.0mm Quantity: 10Pcs Size Details: Size: 0.8mm: 0.08cm x 3cm/0" x 1.2" (Approx.) 1.0mm: 0.1cm x 3cm/0" x 1.2" (Approx.) 1.2mm: 0.12cm x 3cm/0" x 1.2" (Approx.) 1.5mm: 0.15cm x 4cm/0.1" x 1.6" (Approx.) 1.8mm: 0.18cm x 4cm/0.1" x 1.6" (Approx.) 2.0mm: 0.2cm x 5cm/0.1" x 2" (Approx.) 2.5mm: 0.25cm x 5.5cm/0.1" x 2.2" (Approx.) 3.0mm: 0.3cm x 6cm/0.1" x 2.4" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 10 x Emery Twist Drill