PORTER-CABLE BN138 5/8-Inch to 1-3/8-Inch 18-Gauge Brad Nailer Features a long life maintenance free motor Internal piston catch Rear exhaust Tool free depth of drive adjustment Tool free jam release mechanism Long-life, maintenance-free motor to keep from staining the work surface Internal piston catch for consistent max power on every shot Rear exhaust to keep contaminants away from work Drives 18-gauge nails from 5/8-inch to 1-3/8-inch length Tool-free depth-of-drive adjustment with detents for proper setting of nail heads