Craftsman 9-18170 1/2-Inch Crown 20 Gauge Stapler Kit Sequential and contact trip mode for single fire or bounce fire operation 1/2-Inch crown 20 gauge staples from 3/8 to 1-Inch length Includes 500 staples 1/2-Inch and 500 staples 3/8-Inch For upholstery furniture insulation and screen applications Rear exhaust for quiet operation