Features: Precision-Parallelogram Design: Engineered with an innovative parallelogram mechanism that guarantees accurate center alignment every time. Effortless Mortise & Tenon Centering Eliminates guesswork for woodworking joints: The precision-machined parallel arms adjust seamlessly to material thickness, positioning the marking bar at the exact midpoint. Simply scribe both sides of the bar for flawlessly centered lines Instant Center Line Marking: Place the gauge on any wood edge, squeeze the sides, and let the self-centering bar instantly reveal the midpoint. Ideal for marking center lines on boards, dowels, or sticks with unmatched speed and accuracy Versatile Workshop Companion: Perfect for plate grooving, pin joints, assembly alignment, drilling reference lines, mortises, rabbets, and more. Crafted from durable stainless steel, this tool withstands heavy use while maintaining precision Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Material: Aluminum + Stainless Steel Weight: 420g-450g Product size: 10x15cm Package List: 1 Set Center Gauge