Grex 20 Gauge 1/2 in. Crown Stapler, 3/16 to 5/8 in. Length is designed for projects that require a heavier flat-wire staple with a wider crown and thicker gauge. This stapler uses 20-gauge 1/2" crown staples with lengths ranging from 3/16" to 5/8", making it versatile for various applications. The GREX 50AD model is available in four different designs to suit different needs, including the industry standard 50AD, the long nose 50ADLNS for longer reach, the auto-fire 50AF for faster production, and the auto-fire long-magazine 50AFLM for continuous speed with less reloading. Built for speed, ergonomics, and convenience, the 50AD features a patented trigger valve design that allows for fast air recycling, reducing air consumption by 20% to 40% d to competitors. This means more tools can be powered by a single compressor. The quick release magazine latch is conveniently located near the operator’s pinky finger for minimal effort and hand movement, and the drop-in loading system enables fast reloading of staples. Its heavy steel head cap is designed for hammering, while the slim profile maximum visibility and mobility during use. Constructed with a lightweight aluminum body, the stapler is comfortable for all-day continuous use. It includes a precision-machined aluminum piston and cylinder, a durable driver and O-ring assembly, and a rear exhaust with silencer to reduce noise and direct exhaust air away from the user. The rubber handgrip ensures a firm and comfortable hold. This stapler is compatible with Duo-Fast 5000 series and Senco F series staples, making it a reliable and versatile choice for professional stapling needs. Model Number: 50AD