Drill bit Rechargeable driver drill bit Hex shaft / Opposite side: 6.35mm Usage : *For Pre-drilling of block, mortar, plasterboard & wallpaper, etc. Knurled shaft drill bit for concrete For vibration & rotation Usage : *Pre-drilling of concrete screws (no plug required), etc. *The long type is ideal for deep-hole drilling. Point hammer /SDS shaft type For lightweight hammer drills Usage : *For drilling holes in concrete, blocks, stone & mortar, etc *For penetration & deep hole drilling *Waterproofing & reinforcement SDM drill bit For SDS-max shaft Usage : *For pre-drilling for metal expansion anchors *For pre-drilling of adhesive anchors *For pre-drilling of slope work