Premier k-files are used to enlarge canal after debridement with a Reamer. After Reamer, use a File one size smaller than the Reamer so that the fragments of dentinal shavings can be carried away from the root-canal walls. Use in clockwise direction (1/4 turn only), then withdraw. Extremely sharp - efficient instrumentation Pre-mounted silicone (non-latex) stop Firm grasp - peanut shaped handle ASIN B07FB4138N Item Weight 0.8 ounces Manufacturer Premier Dental Item model number PR-9053425 Package Dimensions 1 x 1 x 1 inches