1.Dual-Clamp Fixation: This adjustable dual-clamp hinge jig ensures precise alignment, unlike single-clamp versions, providing superior stability and preventing slippage. Its built-in dual-clamp design quickly and securely holds workpieces in place, preventing displacement of hole positions and ensuring drilling accuracy and stability. It also minimizes drilling deviations caused by workpiece movement, reducing errors and maintaining drilling precision. 2.Sturdy and : The door hinge jig frame is made of high-strength aluminum alloy, while the drilling tools are made of carbon steel and YG8 hard alloy. The overall structure is stable, ensuring durability and adaptability to different environments, including harsh weather conditions, high temperatures, and moisture. It maintains its strength and stability, with minimal risk of deformation or damage even with prolonged use. 3.Precision Drilling: This tabletop concealed hinge jig achieves quick and precise hole alignment through the adjustable positioning plate for edge spacing and the top-bearing depth adjustment. You can easily adjust the edge spacing by loosening the screws, with a range of 0.12-0.28 inches (3-7 mm), and the drilling depth ranges from 0.39-0.59 inches (10-15 mm). The higher the top-bearing height, the more precise the holes it drills. 4.: Our hinge jig kit is easy to operate and install without professional assistance. Just follow the 4-step instructions in the manual: Step 1, replace the top nut with a butterfly nut; Step 2, install the tools, top bearing, and limit ring in sequence; Step 3, adjust the hole spacing and clamp the workpiece securely; Step 4, use an electric drill to fix, drill the holes and side holes, and install the hinge. You can complete the installation in just a few minutes.