A very useful instrument to punch out donor cornea button from the endothelial side. Special Features Universal: Any size of trephine from 6mm to 11mm can be fitted Precentered: The trephine and the Teflon block are automatically centered for all sized trephines Spring recoil system: After completion of the cut, trephine retracts back with inbuilt spring system Sterilization Any method namely dry heat, autoclaving & E.T.O gas can be used to sterilize the punch