Description: 【Package Including】: You will get 1x square hole drill bit adapter with screws, 1x handle(quick turn handle allows for quick bit changes). 【Premium Material】: Square hole drill bit adapter bracket set is made of steel material, which is wear resistant, high hardness and sturdy, ensuring long term use. 【Adjustable Clamp】: The adjustable clamp diameter of the Square hole drill bit adapter bracket is between 3.5cm/1.38 inches-5.5cm/2.17 inches. 【Easy to Install】: Bench drill mortise accessories, the square hole drill bit adapter converter is simple and quick to install and remove, quick and convenient. 【Wide Application】: Square hole drill fixed bracket set is a practical woodworking tool suitable for table drills, bench drills and hand drills. Specification: Material: steel Size Chart: Bracket length 15.6cm/6.14inch Handle 12.4cmx3cm/4.88inchx1.18inch Package Includes: 1x Square Hole Drill Bit Adapter 1x handle Note: Please allow slightly errors 1-2cm differences due to manual measurement.