The drill bit with adjustable height enables you to pre-drill holes with a diameter of 4 mm for use with stainless steel screws with a diameter of 5 or 6 mm.
The drill bit height is adjusted with an Allen key (included).
5 cutting edges provide diameters of 8 to 10 mm to accommodate the screw head. This prevents the deck boards from splitting and provides a perfectly smooth surface without any risk when walking barefoot on the deck.
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