Economy graduated ring mandrel available in 2 style:
1. w/ Mark (item # 320-306)
Made from hardened steel and engraved with US sizes 1 to 15 by quarter sizes. Overall length 11 1⁄2".
2. Unmark (item # 320-604)
Ungrooved mandrel without markings. Tapers from 25 to 12.05 mm (1" to .470") in diameter. Made in India.