Biomet 3i Certain Prevail Implant II OS3415 3.25mm(D) x 4.1 (W) x 3.4mm (P) x 15mm (L). This Implant has Expired !!! (It has passed its use by date) FOR LAB USE ONLY as a lab analog or it can be used in a clear resin display model. All our stock comes from people like you and me that have drawers full of left over implant parts and are happy to part with them for less.