General description The square hole drill bit adapter fixing bracket is a professional woodworking tool designed for accurate and smooth drilling. Made from high-quality cast aluminum, it is wear-resistant, sturdy, and has high hardness. Technical specifications Material: Cast aluminum Clamping part diameter: 38mm-43mm (1.50inch-1.69inch) Measurement allowed error: +/- 1-3cm Compatibility and accessories Suitable for hand electric drills Not suitable for bench drills and rechargeable hand drills Installation Easy to install and remove Fast and convenient installation process Usage The square hole drill bit adapter bracket helps achieve precise drilling results, making it an essential tool for woodworking projects. Other information Package Contents: 1 * Square Hole Drill Bit Adapter Color may vary slightly due to light reflection and different displays