Fangrui Product Details [ Material]: The Square Hole Drill Fixed Bracket Is Made Of High Quality Cast Aluminum Material, Wear , High Hardness, Sturdy And . [fitment]: The Square Hole Drill Bit Adapter Is Suitable For Hand Electric Drills, But Not Suitable For Bench Drills And Rechargeable Hand Drills. [note]: The Square Hole Drill Bit Fixing Bracket Supports The Exposed Clamping Part Of The Electric Hand Drill A Diameter Of 38mm-43mm/1.50inch-1.69inch. Please Confirm The Size Carefully. [easy To Use]: Professional Woodworking Tool, The Square Hole Drill Bit Adapter Bracket Helps Accurate And Smooth Drilling. [easy Installation]: The Square Hole Drill Bit Adapter Mortise Tool Is Easy To Install And Remove, You Can Quickly Install Or Remove It Yourself, Fast And Convenient. Please Note:the Physical Slightly Color Difference Or Difference, Does Not Affect The Use, Please Do Not Mind, Thank You! Colour:as Shown Material:aluminum Package Contents: 1 * Square Hole Drill Bit Adapter Only The Above Package Content, Other Products Ar