【Aircraft Grade Aluminium Alloy and Laser Engraving】The overall body is made from aircraft grade aluminium alloy and the dimensional scales are laser etched for high quality and accurate positioning.,【Ease Of Use】Supports up to 2.4", suitable for most boards and round woods when combined with a power drill, the drill sleeve is made from high quality materials for strength and accurate positioning.,【Multiple Applications】5 standard SAE drill sizes, namely 1/4", 3/8", 5/16", 7/16" and 1/2"; allows you to easily apply it to mortise and tenon joints, build furniture and repair tables, making it the ideal tool for planking.,【What You Will Get】A self-centring jig, an instruction manual, supplied with six hardened steel bushings; two each of 1/4-inch, 5/16-inch and 3/8-inch,【BLEKOO SERVICE】If you find any problems when you use them, feel free to contact us. We would try our best to assist you and ensure your satisfaction.