Lag Screw

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Frequently Asked Questions...

Drill Bit Size For 5/16 Lag Screw/Shields?

I'm trying to resecure my garage door opener to the ceiling (9 year old Craftsman randomly collapsed a week ago.) and I'll be drilling through concrete. What is the recommended drill bit size for a project of this nature?

Best Answer...


you want to use expansion Shields for concrete ceilings,you ll need a 1/2 in. bit for a 5/16 shield.