Inner Micrometer Set, Measuring 5‑30mm Range Accurate Durable Inside Diameter Micrometer with Wrench for Woodworking : Amazon.ca: Industrial & Scientific
Starrett 50542 Solid-Rod Inside Micrometers
Vintage STARRETT Solid Rod Inside Micrometer Set No. 124A 3-12 W/Original Box | eBay
STARRETT Tubular Inside Micrometer Sets
Mitutoyo 368-918 3-Point Internal Micrometer Kit, 0.8 to 2" (20.32 to 50.8 mm)