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nope. Hilti 1/4 bit

Don't tell me the GRK bit is meant to work with Caliburns and no other bit will do ;-?
Screw anchors work on a really tight tolerance, hence why hilti makes a series of special bits for their screw anchors depending on what type of surface you are anchoring too.

If you have an overdrilled hole toss in a piece of scrap copper wire or a zip tie tail.
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