22 Gauge 3/8" Crown "C" Type Upholstery Stapler The Air Locker U630A 1/4" to 5/8", 22 gauge C-Crown Upholstery Stapler is an easy to use pneumatic stapler with plenty of useful features. It uses standard Senco® C Type 22 gauge, 3/8 inch crown staples to get the job done right. The high-capacity bottom-load magazine handles 200 staples and the driver guide moves back to clear jams from the magazine.