To get more life out of drywall screw bits, file the tip when the sides become rounded over. This allows the bit to enter the screw head a little deeper, thus engaging a part of the bit that still has crisp edges.
Mick Cappelletti, Newcastle, ME
Fine Homebuilding Recommended Products
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BOSCH Compact Router (PR20)
Spyder Stinger Spade Bit
Metabo HPT Impact Driver (WH18DBDL2)