Spring diameter 1/4″. Bent boring end, designed to pass through sink strainer, trap, and fittings. Professional-Type sliding crank handle with hand grips is rotated like a brace and bit and revolves the spring auger which is clamped tightly with a thumbscrew. Handle is moved up as the auger is worked into the stopped bowl or sink. No. 8PQH: Type: Cleanout, Cable Size: 1/4″ x 8′, Material: Carbon Steel No. 15PQH: Type: Cleanout, Cable Size: 1/4″ x 15′, Material: Carbon Steel No. 25PQH: Type: Cleanout, Cable Size: 1/4″ x 25′, Material: Carbon Steel