Note: Square drill and electric drill are not included. [Standard Drill Adapter] The square drill adapter fits both pillar drills and hand drills with a diameter between 38 and 55 mm (1.5 and 2.2 inches), allowing for easy installation and use. The ideal solution for increasing the versatility of your pillar drill and hand drill. [Versatile Holder] The square drill adapter fits both pillar drills and hand drills. It is suitable for woodworking, furniture making, and other related fields. [Standard Drill Attachment] The mortise adapter is easy to install and remove. You can quickly install or remove it yourself, saving time and effort. [High-Quality Material] The fixed square drill holder is made of durable cast steel. If you are looking for a versatile and efficient way to quickly install or remove drill accessories, the square drill adapter is the perfect choice! Note: Long-term storage in a humid environment may cause surface rust, which can be easily removed by wiping with a protective film. [Efficient and Precise] Thanks to its precise design, the adapter ensures accurate and smooth drilling operations. Color: See picture. Material: Steel. Package contents: 1 x Square hole drill adapter. Only the above package content is included. Note: The color of the item may differ slightly from the image shown on your screen due to light reflection and your monitor settings. A margin of error of +/- 1 to 3 cm is possible.