PLUMB-BOB BRASS 16 OZ. The Kraft Plumb-Bob Tool is made of brass. It is used by DIY-ers and builders for deck construction, plumbing work or transit laying. This tool helps to measure the correct vertical alignment on structures and find the exact point directly under the plumb line.It features a removable cover and hardened steel tip for easy centered column installation. The solid brass design of this plumb bob makes it highly durable and long lasting. It is rust resistant and has a machine-gloss finish.