Feature: 1. [Premium Material] This core drill bit is composed of premium alloy steel components and excellent diamond abrasive grains with the length of 9.5in, ensures longer core life. 2. [5/8‑11 Thread] With 5/8‑11 universal thread, this core bit is applicable for various devices, which can be easily and quickly assembled to a standard fixed or hand held drill machine. 3. [Wet and Dry Drilling] The core drill bit is available for both dry and wet drilling, meet your different job needs, a small amount of water can extend the lifespan. 4. [High Performance] The core drill bit is fine made, can provide efficient and smoothly working performance, with good stability, easy to install and operate. 5. [Wide Application] This core drill bit can be used to drill concrete, red brick, marble and other materials when installing air conditioner, plumbing, stair railing, etc. Specification: Item Type: Core Drill Bit Material: Alloy Steel, Diamond. Package List: 1 x Core Drill Bit1 x Saw Blade1 x Washer Note: Please allow slight size error due to manual measurement. Thanks for your understanding.