Seco 16 oz (454 g) Plumb Bob The Seco 16 oz Plumb Bob offers a balanced combination of weight and precision, making it a versatile choice for everyday surveying and construction layout tasks. Its solid brass construction ensures dependable performance in a wide range of field conditions. Key Features • Solid brass body for durability and consistent plumb alignment • Hardened steel tip for precise point transfer • Built-in storage area for replacement point • Well-balanced 16 oz (454 g) design for general field use