The Bostitch 1/2" Crown 16 Gauge Siding Stapler (2" Sheathing) (650S4-1) features an AntiJam magazine along with an overmolded rubber grip that maximizes comfort and minimizes fatigue. The long narrow nose improves line of sight. Accepts 16-gauge, S4 staples with 1/2" crowns, 1" - 2" in length.