18 Gauge, 2 1/8 inches, air inlet 1/4 NPT. Magnesium main body, durable and ultra light. Metal cylinder for increased durability. Oil free design. Adjustable depth of drive. Selective actuation trigger. Rotatable rear exhaust and belt hook. Swivel air plug. Over mold rubber comfort grip. Includes cas and wrench. Tool weight 2.48 lbs.