Combination screws mean higher productivity. Like their nail-and-staple counterparts, Senco countersunk screws offer professional installers a number of benefits, not the least of which is an overall increase in work productivity. This is due in part to the fact that collated systems reduce the amount of time spent loading and installing loose fasteners, eliminating the need to feed one fastener at a time. Includes: (4000) Gauge 7" x 1" Combination base screws.