Description: These extra long can be used for more convenient work. Suitable: The straight design is more suitable for many electric drills and drills. Material: Made of high speed steel durable and compact. Application: Suitable for aluminum etc. Portable: Portable and stationary use. Specification: Material:High Speed Steel Size Chart: 0.1cm/0.04inch 0.15cm/0.06inch 0.2cm/0.08inch 0.25cm/0. 0.3cm/0.12inch Package Includes: 10 Twist Drill Bit Note: Please allow slightly errors due to manual measurement and different monitors.