Surface Gauge Scribers Base Size 3 1/2 in x 3 3/16 in Spindle Diameter 3/8 in Step Type V-Step Includes Scriber Number of Pins 4 Scriber Diameter 5/32 in Scriber Length 8 1/2 in Snug Mount Hole Diameter 9/64 in 5/32 in 3/16 in 1/4 in Spindle Length 12 in and 18 in