Extra 3750 Pieces Staples: Package come with 3750 Pieces 1/4", 3/8", 1/2" Arrow T50 staples (Each 1250 Pieces), providing options for a variety of projects. [Pneumatic staple gun requires use with an air compressor, which is not included Professional Safety Stapler: Can be used on compressors up to 120 psi (recommended use at 60 - 100 PSI). Contact safety feature requires contact with nailing surface before firing to prevent misfires Adjustable Exhaust Cover: Designed with adjustable exhaust cover allows you to direct exiting air flow, which will bring you a better working experience Easy Operation: The heavy duty staple gun designed with easy-load magazine, you can easily install the staples. Includes staple-viewing window for helping to check for staples. Overmolded comfortable grip help reduce hand fatigue Wide Application: The Arrow PT50 pneumatic stapler is compatible with 1/4"(6mm)-9/16"(14mm) T50 staples. Ideal for upholstery, carpentry, decorating, screen repair, cable fixed, crafts projects. Suitable for general repair and professional uses