Zimmer 2255 32 37 M DN Intramedullary Fixation Tibial Humeral Drill 3.7mm Personal Health Bathroom Aids the 2557E utilizes a "squeeze to release" Model:Portable Rechargeable Revelation III Trinocular the 2557E utilizes a "squeeze to release" mechanism that provides superior stability during the high stakes moment of plug insertion or removal 5mm LCP or DCP plating systems The Zimmer 2255 32 37 is an essential high performance power accessory designed for the precise preparation of interlocking screw holes in long bone fixation M DN System Compatibility: This bit is factory calibrated to match the tolerances of Zimmer M DN nails