Starrett Solid Steel Plumb Bob with Strong Braided 8' Nylon Line for Layout Work, Construction and Surveying - Hardened Steel, Hexagonal Shaped, 2-3/4 oz. - 177A: Amazon.com: Tools & Home Improvement
Vintage Solid Brass 4 oz PLUMB BOB Tool Hexagonal Shape Has Old String 3" Long | eBay
Bob's Rock Shop: Introduction to Crystallography and Mineral Crystal Systems
General Tools Steel Plumb Bob, 1 ct - Harris Teeter