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Applications: This door lock grooving jig is designed for installing hotel doors, security doors, and adjusting door locks. This lock kit can be used for creating new grooves, creating eccentric grooves, changing passwords, and replacing fingerprint locks. It is safe to operate, grooves quickly, comes in a full range of sizes, and is easy to use. You can install/replace door locks yourself. Wide Compatibility: This professional grooving jig is suitable for solid wood doors of various thicknesses. Drilling grooves in expensive door panels using ordinary tools can be challenging. Using flat drills and electric drills can damage expensive door panels. This very convenient jig kit helps you avoid alignment errors when drilling the correct holes for locks. It comes with a depth adjustment ring and carbide drill bits to drill perfectly flush holes from the door edge. User-Friendly: This grooving jig is easy to understand and use, and can be easily mastered by both professional woodworkers and beginners. However, if you are a beginner, it is recommended that you first cut on scrap wood of the same thickness to avoid damaging your new wooden door. Mortise locks can save you a lot of time and effort. It is affordable and ideal for DIY enthusiasts and contractors. We provide videos and manuals for your reference. [3 Milling Heads: 18/22/25 mm] This product includes 3 milling heads of different sizes (18/22/25 mm) made of tungsten carbide (TC) steel, which is of superior quality to high-speed steel. It can firmly clamp wooden doors of most thicknesses. Overcutting is prevented by using vertical guides with height and depth limits.