Locking arbor shanks with high speed steel (HSS), HSS extended length or carbide tipped pilot drills are designed for use with hole saw diameters between 32mm-210mm. The arbor locks tightly on the saw, eliminating vibration and is invaluable on exceptionally tough jobs and production runs. • For use with hole saws ranging from 32-210mm • HSS drill • Arbor locks tightly on hole saw, eliminating vibration and prolongs the saw lifeScrew Thread: 5/8-18Country of Origin: CN Specifications Arbor Shank Sizes metric: 8.75 hexmm Arbor Shank Sizes imperial: 11/32 hex" Chuck Size metric: 6,35mm Chuck Size imperial: 1/4" Drill Length metric: 79mm Drill Length imperial: 3,1/8