TAPCON 3/16X1-1/4 CONCRETE ANCHOR HEX HEAD 75-PK THE ""ORIGINAL MASONRY"" ANCHOR THAT CUTS ITS OWN THREADS INTO CONCRETE BRICK OR BLOCK. MAXIMUM PERFORMANCE IS ACHIEVED BECAUSE THE TAPCON ANCHOR THE CONDRIVE INSTALLATION TOOL AND THE CARBIDE-TIPPED TAPCON DRILL BITS ARE DESIGNED TO WORK AS A SYSTEM. IT IS ESSENTIAL TO USE THE CONDRIVE TOOL AND THE CORRECT DRILL BIT TO ASSURE CONSISTENT ANCHOR PERFORMANCE. UL STYLE""MARGIN-TOP0PX; PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" WORKS IN ALL MASONRY BASE MATERIALS FAST AND EASY 3 ANCHORS PER MINUTE NO HOLE SPOTTING OR INSERTS REQUIRED REMOVABLE SLOTTED HEX AND PHILIPS FLAT HEAD STYLES