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 purposeIDF for thin plate & Shallow DrillingID for General PurposeSee the online yestool catalog for the full selection of drill bodies & inserts.