Plumb Bob Material Brass Finish Brass Plated Included Components String Weight 0.01 lb System of Measurement SAE Tip Material Brass Includes Additional Tip Features Comes with Extra Tip Polished-Lacquer Solid-Brass Construction is Rust Resistant Replaceable Hardened Steel Tip Screw Top Simplifies Attaching String to Center of Plumb Through Hole for Easy Tightening