The YESTOOL FSL Drill Body is designed with a flange to increase stability therefore reducing chatter & Vibration. This increases inserts life dramatically. The body is made of premium tool steel, heat treated, ground and tin coated for lubricity. 3 types of inserts are available: IDP for deep hole & General purpose. IDF for thin plate & Shallow Drilling. ID for General Purpose. See the online yestool catalog for the full selection of drill bodies & inserts.