M4.5 x 65mm
KTX bits accompany all boxes and tubs for free. They are 50mm in length which makes them ideal for use in impact drivers as well as drill/drivers.
The screws have a nano-coating which has been salt spray tested beyond 2000 hours and have a C4 European rated coating guaranteeing at a minimum 15 years in timber externally. The screws are ideal for decking, fencing and other external uses and particularly blend in well with timber.