Weatherex III is approved for ACQ pressure treated lumber. Senco DuraSpin screws are collated 50 screws per strip. Collated screws mean no more screw slivers or painful finger cuts from loose bulk screws. Reduced waste – Eliminate the waste experienced with bulk screws (can be 10% to 15% of total screws used) Patented SENCO DuraSpin feed system drives screws quickly and efficiently without jams or misfeeds. Senco DuraSpin Screws Also Fit: Makita, Milwaukee, Grabber, Hilti and PAM Collated Screw Drivers.