#4 Rebar Survey Monument, 1/2" x 18" Create durable survey monuments, property corners and reference points with this 18-inch #4 steel rebar . The ribbed steel construction provides a strong, dependable marker for permanent and semi-permanent survey applications and construction layout. Sold individually. Key Features #4 rebar measures 1/2" in diameter and 18" long. Ribbed steel construction provides strength and secure placement in the ground. Ideal for survey monuments, property corners, control points and construction marking . Sold individually for convenient ordering by project requirements.