For outdoor mounting of decking, fencing, etc, against wooden joists. Suitable for pressure-impregnated timber. Cutting point that grips firmly and prevents crack propagation. Grooves and milled thread for good countersinking. Torx T20. 2 bits supplied. Surface-treated (ruspert) steel. Corrosive class: C4.
Corrosive class: C4.
Material: Ruspert-treated steel (C1022).
Torx groove T20.
Countersunk head with 4 grooves.
Milled groove in the tip (type 17), grips and prevents crack propagation.
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