AllinOne Carpentry Solution: Includes both a Positioning Block and a Steel Ruler for comprehensive measuring needs in woodworking or DIY projects. Quick Adjustment Feature: Effortlessly draw precise straight lines; the knob adjusts easily and locks securely at any point along the ruler's edge. Secure Locking Capability: Engineered with a strong locking mechanism that guarantees stability, allowing you to focus on your work without interruptions. Quality Material: Crafted from CNC aluminum alloy, this tool is built to endure heavy use while maintaining accuracy over time. Use scenarios Cabinet making or shelving projects: set the positioning block to a fixed offset, then scribe straight lines along the ruler to guide cuts with consistency. Repeat straightline markings: slide the knob to multiple positions and lock at each to mark identical lines for parallel cuts or grooves without remeasuring. Drawer fronts and upright assemblies: align boards using the positioning block to maintain parallel edges and straight lines during layout and assembly.