Senco 520101N SCN60 Coil Nailer, Contact Actuation Drives 11, 111?2 and 121?2 Gauge. Round-Head Nails. 2-Inch-2-3/4-Inch 6d to 9d Nail Range. Capacity 250-275. Highest power-to-weight ratio in its class Adjustable depth-of-drive allows for precise countersinking at a lower air pressure