Precision Blue And Gold Suh Dacamara Strabismus Recession Grooved Muscle Hook Right. 0.55mm Wide Grooved Track in a 1.1mm Wide Hook x 11mm Long. Top View of Hook Width is Tapered from 1.0mm to 0.8mm at Tip. Knobbed Tip is 1.4mm High and 1.7mm Wide to Prevent Muscle Slippage. Straight Shaft from Handle to Bend is 1.8mm Wide for Stability. Working Length is 1 1/4" (31mm). Overall Length is 4 15/16" (125mm) on a Grooved Round Titanium Handle.