This spring style carrier has a 3/8"-16 threaded female stud for attaching to 3/8" or 1/2" 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-100-6 sonde carrier fits easily onto 3/8-inch or 1/2 rod, perfect for the Good Buddy II 3/8" Duct Rodder, Good Buddy III 3/8" Duct Rodder, or Big Buddy 1/2" Duct Rodder.