Gimbel-Mendez Beveled Degree Gauge Titanium 4" Round Handle, with 11.7mm Internal Diameter, Measures 0-180 Degrees In 5 Degree Increments, Labeled at 30 degree Increments, Ring Mounted At 0 Degrees. 36 Blunt Teeth for Fixation. Titanium (Gray) Round Handle. For Use with Bores 2-Ray Meridian Marker 9982EA