Experience flawless drilling with our robust hole saw arbor - a must-have tool for precise and efficient cutting tasks. Specification: Material: Carbon Steel Drill Bit Diameter: 1/4" / 6.3mm Hex Shank Arbor: 1/2" / 12mm Friendly Advice: 1. Please double-check the desired product measurements prior to completing your purchase. 2. Our images aim to be as accurate as possible, but please be aware that there may be some color variations caused by factors like devices, lighting conditions, and display screens. 3. Please note that due to the hand-measurement of our products, there might be a 1-2 millimeter variance between the actual size and the stated dimensions.