The Unknown Model Air Pneumatic Straight Die Grinder Screwdriver by Mac Tools is a high-quality tool designed for automotive and industrial applications. This screwdriver features a palm grip design for comfortable use and a 1/4in. collet size for precise cutting. With a variable speed trigger and adjustable speed regulator, users can easily control the tool for optimal performance. Made in Taiwan, this grinder screwdriver is a reliable and efficient option for professionals in need of a powerful and quiet tool (100.8 DB(A) sound level).