This spring style carrier has a 5/16"-18 threaded female stud for attaching to 1/4" pushrods to provide a safe encosure for the sonde. The sonde carrier weighs 0.581 lbs. with a 1" diameter and is 7.75" in length. PTSC-100-5 sonde carrier fits easily onto 1/4-inch rod, perfect for the Easy Buddy 1/4" Duct Rodder.