Surface Gauge with Scriber, Base Size 2.559 in x 3.307 in x 1.063 in, Spindle Diameter 10mm, Step Type V-Step, Includes Surface Gauge, Number of Pins 2, Screw Type Plastic Knob; Metal Knob, Scriber Diameter 10MM, Scriber Length 8 in, Snug Mount Hole Diameter 4 mm, Spindle Length 12 in