1. Drilling can be easily started without pre-drilling. Drilling speed is fast and friction is extremely low. 2. It is generally applicable to all kinds of metals, organic glass and hard plastics. 3. It is very suitable for home DIY and general construction and engineering. 4. Use with needle vice or low-speed electric drill ( to impact drill). 5. Application: High speed steel drill bit set for wood, plastic and aluminum. Ideal for DIY, home and general building/engineering use. Type: Twist Drill Bit Uses: drilling holes made of aluminum, iron and other materials. Specifications: 1.5mm x 16, 2.0mm x 16, 2.5mm x 15, 3.0mm x 10, 3.2mm x 10, 3.5mm x 8, 4.0mm x 8, 4.5mm x 3, 5.0mm x 3, 5.5mm x 2, 6.0mm Material: steel colour: Black yellow Package Contents: 1 set x Twist Drill Bit (99pcs) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The