Decking Tools

Countersink decking tools combine a high-speed fluted drill bit with a countersink cutter and a free-spinning depth-stop collar, so every hole gets the same pilot and the same countersink depth without marking the deck. Essential in dense hardwoods like merbau and spotted gum where decking screws cannot drive without pre-drilling.
Tool Construction
A fluted pilot drill inside a countersink cutter, with a free-spinning depth-stop collar that sets a consistent depth and keeps the cutter off the board face. Anti-clog design keeps the cut visible.
Matching the Tool to Your Screw
Match the tool to the screw gauge (8g to 14g) and head style (standard or trim head). These are also listed in our Tools category.
WHY AUSTRALIA TRUSTS BOLT & NUT
With 15+ years selling fasteners and drilling tools online from Brisbane, we hold over 25,000 stock lines and 200 million pieces. 98.75% of online orders placed before 1pm leave same day. Save more as you buy more — we offer up to 13 price breaks plus 3 spend-tier discounts. Read our customer reviews or get in touch if you need help picking the right drill bit, holesaw or set for the job.
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3.2mm x 46mm Replacement Drill Bits for 8g Hobson EZ-Bit Decking Tool LB-00502As low as $11.050 each -
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3.6mm x 46mm Replacement Drill Bits for 10g Hobson EZ-Bit Decking Tool LB-00503As low as $11.050 each -
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4mm x 60mm Replacement Drill Bits for 12g Hobson EZ-Bit Decking Tool LB-00504As low as $13.600 each -
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5.25mm x 60mm Replacement Drill Bits for 14g Hobson EZ-Bit Decking Tool LB-00507As low as $15.300 each -
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5.25mm x 95mm Replacement Drill Bits for 14g Hobson EZ-Bit Decking Tool LB-00506As low as $16.150 each
Pre-drilling and countersinking tools that bore the pilot hole and cut the countersink recess for a decking screw in one pass. Also stocked in our Tools category.
TECHNICAL RESOURCES
For the full library of dimensioned PDFs and CAD references, see our Technical PDF's Library.






