Used to prepare the upper and middle part of non-curved canal or straight part of curved canal Creates an access point for reamers and files Enlarge the straight coronal portion of the canal with Gates Glidden Drill and step down with endo files using the biggest size first as the Crown Down technique For opening the orifice of the root canal Superior stainless steel with improved cutting capacity Circle ring is coded on the shank Recommended speed: 800 ~ 1200 r/min