The General Tools 5 Oz Steel Plumb Bob can determine the vertical (or plumb) line from the suspension point to a point on the ground. Made of hexagonal, rust-resistant nickel-plated steel. Self-centering cap simplifies cord replacement. Bob: 3-3/8 in. (L) x 3/4 in. (W). Cord: 10 ft. (L) x 3/32 in. (Diameter).