Bosch TC700 Masonry Screw Drill Bit Holder Go to amazon.com Related posts Expert choice for anchoring screws FeatureFor use with masonry fastening systems/hex sleeve drive toolsHex drive on bit fits into driver sleeveIncludes hex keyHolds bit tightly DescriptionFor masonry fastening systems/hex sleeve drive tools. Hex drive on bit fits into driver sleeve. Tight dimensions to ensure low run out.