Plumb Bobs with Hardened Steel Tip | BAHCO | Bahco International
Seco 16 Oz. Plumb Bob Surveying Instrument - Solid Brass
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AWF PRO Plumb Bob Kit - 16 oz and 8 oz Solid Brass Plumb Bobs, 14 ft Retractable Line Reel with Magnetic Base, 2 Pencils, Pencil Sharpener, Carrying Case - Amazon.com
DIY Dictionary: What is a Plumb Bob? — The Family Handyman