/ Precision Measuring Tools / Precision Hand Tools / Slide Calipers / Slide Caliper Accessories / PT22287 * Not actual product image 65861 PT22287 Dial Depth Gage Accessory 65861 Other similar products 7" (175mm) Base Extension (for No. 450/450M). Downloads Contact Starrett Downloads Catalog 33 - Section 4 - Depth Gages We offer a choice of depth products varying in form, complexity, cost and accuracy, from the most accurate depth micrometers (electronic, dial and vernier) to the less complex precise rule gages and combination rule gages. Precision Hand Tools (Catalog 33) 612 page catalog featuring precision hand tool, force measurement, vison systems, optical comparators, laser measurement, and flat stock.