Lu-Mendez Fixation Ring and Incision Guide for Placement of Limbel Relaxation Incisions, Overall Length 4 1/4" (110mm), Outer Ring Diameter 18mm / Inner Ring Diameter 13mm, Wth 15 Micro Teeth On Bottom Inside Of Ring, Cutout Is 8.5mm From Inner Diamter Point Inner Diameter Point And 12.5mm From Outer Diamter Point To Outer Diameter Point, On A Flat 75mm Handle