Combo Drill Bit, for Install of Hurricane Sidewalk Bolts, 1/2" x 2" Depth w/ 1/4" Pilot.

Hammer drive drill is need or the bit will burn out early.Carbide-tipped Combination Bit adjust to different counter sinking depths. This combo drill bit is for the installation of 1/4-20 Sidewalk Bolts. Once adjusted, duplicate holes with exactly the same depth can be quickly drilled one after another! Comes with Hex Wrench for adjusting. 1/2" Hole is for setting 1/2" machine screw anchors. 1/4" Pilot bit for a small hole to allow clearance for the screw or bolt to pass through. This carbide-tipped pilot drill helps to prevent walking and shifting.

• Use to drill perfect holes for 1/4-20 Machine Screw Anchors in either concrete or CBS
• Smaller pilot bit starts the hole in the correct location then the larger 1/2" bit drills the perfect sized hole for the anchors
• Large diameter drill bit is approx. 1-1/8" in Length not including collar - Overall drill bit is 3" Includes
• Includes adjustable collar and hex allen wrench allowing you to set the depth of the hole