To drill clearance holes for countersinking the bolt head and washer in 1 action, securely attaches to bit with a heavy duty set screw.

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Where building requires thru-bolts to run the full vertical height of the log wall, or any other bolted connections these tools and accessories are necessary items. After your thru-bolt hole is drilled, these counter bores can be combined with the appropriate pilot to drill the counter-sink hole for the appropriate washer. The counter-bore can also be combined with the SHARK-BIT Twist Drill, to drill the countersink hole in laminated and engineered wood products.

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