[PRECISION PARALLELOGRAM DESIGN]Adopts innovative parallelogram structure to accurate center alignment every time, with interchangeable Metal rods in metric sizes to match different needs [MULTI-FUNCTIONAL WORK COMPANION]Suitable for panel grooving, pin jointing, assembly alignment, drilling reference lines, mortise and tenon joints, tongue and groove, etc []The tool is made of Metal and can withstand heavy-duty use while maintaining accuracy [WOOD POSITIONER] The center gauge eliminates guesswork when making fine cuts to align mortise and tenon joints, and the precision-machined parallel arm quickly adjusts to the thickness of the wood [FLEXIBLE SIZE OPTIONS] Available in metric, each Metal scribing bar ensures clear, long-lasting scribing lines for professional results Product Name: Center Gauge Type:Woodworking Tools F unction:Find and mark the exact Size: 15 x 10 x 3cm/5.9 x 3.9 x 1.2in C:Metric Set: Center gauge with 4mm, 5mm, 6mm, 8mm and 10mm Color: As Shown Material: Metal Package Contents: 1set * Woodworking Marking Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.