The Starrett PT22431 EDP # 64640 Depth Attachment is a high-quality tool designed for precise measurement and inspection in metalworking applications. Made by the reputable brand Starrett in the United States, this depth attachment is compatible with the 120 model dial caliper for accurate and reliable readings. Ideal for CNC machining, metalworking, and manufacturing processes, this attachment ensures accurate measurements and inspections for a variety of industrial applications.