Feature: 1. Applicable Thickness: This self centering pin jig is suitable for wood thickness ranging from 0.4 to 2.4 inch. Whether it is a thin veneer or a thick board, it can provide a perfect fitting, ensuring strong adaptability to different projects, and only for drilling straight holes. 2. Drill Bit Adaptability: This locating dowel guide jig can adapt to various drill bit sizes, including 1/4 inch, 3/8 inch, 5/16 inch, 7/16 inch, and 1/2 inch. Simplified your workflow, saving you time and effort on each project. 3. 2 Drill Sleeve Options: Equipped with 2 thread replaceable drill sleeves and 2 fixed drill sleeves, you can freely customize the settings of any project, ensuring the stability and flexibility of woodworking work and improving work efficiency. 4. Easy Alignment: This doweling jig has center line on both the side and front, making it easy to achieve accurate alignment without worrying about bent holes or misaligned seams. Its user friendly design ensures stable use for both beginners and carpenters. 5. 6 Drill Bushings: Equipped with 6 drill bushings, 2pcs each for 1/4 inch, 5/16 inch, and 3/8 inch, to meet different usage needs. With a hex wrench, providing convenient and efficient work, suitable for various installation and woodworking projects. Specification: Item Type: Woodworking Doweling Jig Kit Material: Aluminum Alloy Fit Drill Bit Size: 1/4 inch, 3/8 inch, 5/16 inch, 7/16 inch, 1/2 inch. Package List: 1 x Doweling Jig 6 x Accessories 1 x Hex Wrench 1 x User Manual