This auto-feed attachment is designed for the Bosch GTB18V-45 drywall screwgun. The GMA22 enables precise driving of rows of screws at top speed, while allowing comfortable continuous work, for added efficiency. It allows fast repeatable fastening without having to load one screw at a time by hand. It has an ergonomic design and is extremely light in weight. The drywall screwdriver attachment has an open design to help prevent debris from getting trapped in the mechanism, allowing for a longer product life. The GMA22 uses widely distributed strips of screws. These screws have lengths of between 1 In. (25 mm) and 2-1/8 In. (55 mm), screw shank diameters up to 0.2 In. (5 mm), and screw head diameters up to 3/8 In. (9.5 mm). the Bosch GTB18V-45 is an ergonomic screwgun, getting drywall jobs done comfortably and fast. It has a well-balanced grip, allowing the thumb and the index finger to control the operation, and Xtend Drive to activate the motor only when the bit senses pressure.