Keyfit Tools 12" x 1/2" Dia. LARGE FLEX GUARD Replacement Drill Bit installation tool, 3/8" & 1/2" Size Easily & Quickly drill in FLEX GUARD driveway marker mounts stakes reflectors snow plow markers snow poles reflective markersCarbide Saber Tooth Chisel Tip, Large Gap Double Flutes Designed For Fast Drilling In Dirt, Clay, Gravel, Even Frozen Ground & Solid Ice Instructions: Drill a 6" hole. Insert FLEX GUARD and marker 6" deep. See all our products at Keyfit Tools ~Keyfit Tools Patented Products 1/2" WIDE FOR 1/2" DIA. Markers Easily Install FLEX GUARD Marker Mounts & regular 3/8" and 1/2" driveway markers FAST & STRAIGHT even in tough hard ground, dry hard pan, clay, gravel EVEN FROZEN GROUND & SOLID ICE! IT'S NEVER TOO LATE to install FLEX GUARD Mounts. Use with reflective driveway markers, stakes & reflectors Installation Tool Perfect for FLEX GUARD Marker Mounts & snow poles Curb and Mailbox markers CARBIDE SABER TOOTH CHISEL TIP, Large Gap Double Flutes Designed For Fast Drilling In Dirt 12" long Instructions: Drill a 6" hole. Insert FLEX GUARD and marker 6" deep. See all our products at Keyfit Tools ~Keyfit Tools Patented Products