PORTER-CABLE NS100B 1-Inch 18-Gauge Narrow Crown Stapler 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 ga. staples with 1/4-inch crown from 1/2-inch to 1-inch length Tool-free depth-of-drive adjustment with detents for proper setting of staples