Package includes: 8pcs 0.8/1.0/1.2/1.5/1.8/2.0/2.5/3.0mm Diamond Twist Drill Bits, each size per 1pcs , this twist drill bit set has different sizes to meet your different drilling needs. Material: Made of diamond, spiral technology, has both toughness and hardness, not easy to break. The bit is sharp and removes chips with ease. Applicable machine: Widely used in rotary tools such as hand drills, electric drills, flexible shafts, bench drills and hanging mills. Application: Suitable for drilling small holes in glass, metal, shells, jade, beads, marbles, stones, drywall and wires. Due to the different hardness of the material, the effect is also different. Note: Adding coolant can increase work efficiency and extend service life. Item Descriptions: Package includes: 8pcs 0.8/1.0/1.2/1.5/1.8/2.0/2.5/3.0mm Diamond Twist Drill Bits, each size 1pcs , this twist drill bit set has different sizes to meet your different drilling needs. Material: Made of diamond, spiral technology, has both toughness and hardness, not easy to break. The bit is sharp and removes chips with ease. Applicable machine: Widely used in rotary tools such as hand drills, electric drills, flexible shafts, bench drills and hanging mills. Application: Suitable for drilling small holes in glass, metal, shells, jade, beads, marbles, stones, drywall and wires. Due to the different hardness of the material, the effect is also different. Note: Adding coolant can increase work efficiency and extend service life. Package: 8-piece diamond twist drill Item Specifications: Material: Diamond Type:Drill Set Size: 0.8 / 1.0 / 1.2 / 1.5 / 1.8 / 2.0 / 2.5 / 3.0mm Color: Silver Quantity: 8 pieces