Product Description Features Easy to Operate, Light Weight, No Fatigue for Long Time Use; A powerful and reliable high-speed production tool; Performs well at any angles; Noise elimination design, low noise during operation; Low weight, comfortable grip, ergonomic design, and easy operation; Nosepieces conveniently store underneath rubber base; Includes (4) Nose Pieces 1/8", 5/32", 3/16", and 1/4"; Quick-release air valve for fast cylinder return; The vacuum switch is used to effectively utilize compressed air; Comes with replaceable three-piece steel teeth and 2 different kinds of the wrench. Package Includes: 1 x Air rivet gun; 4 x Nose piece ( 1/8", 5/32", 3/16", and 1/4", one of them is on the rivet gun); 3 x Nozzle assistance tool; 2 x Wrench; 1 x Connector; 1 x Rivet collecting bottle; 1 x Manual; High Quality The Pop Pneumatic Riveting Gun is designed for rivets in aluminum, copper, and other softer materials. Different Size 1/4-inch (6.4mm), 3/16-inch (4.8mm), 5/32-inch (4mm), 1/8-inch (3.2mm) (1 piece is installed onto the gun head, 3 pieces are in the package). Specification Maximum stroke:16mm (0.63 in); nail diameter: 4 mm - 6.4mm (0.16 - 0.25 in); 1/4" AIR INLET PORT INSIDE THREAD STD - 1/4" (6.35mm)