Big Timber CTX144 T 25#14 x 4" Construction Lag Screw Knurled Shank Type 17, Bronze, (500per Pack) Interstate Pneumatic Patent pending design with good commercial buildings Patent pending design with good ergonomics Rubber comfort grip ensures a non slip handling and reduces vibrations and fatigue Limited recoil resulting from balanced weight distribution Tool less jam clearing mechanism provides an easy access to the nose if the staple jams Multi directional exhaust adjusts without tools Includes a switchable trigger with sequential fire and bump fire Depth control dial for precise countersinking Light Weight at just under 5 Pounds category all it own Drive: T 25 1200 Hour corrosion resistance in both ACQ and salt spray conditions