Atoplee 1/4" Shank Hex Socket Magnetic Nut Driver Set Socket Adapter[13mm, 1pc] Material: chrome vanadium steel (magnetic) Outside Hex shank:1/4 inch ; length: 65mm/4 to Inner Hex Shank 13mm; Length 65mm Inner Hex Shank 13mm Package Included: 1pc Hex Socket Magnetic Nut Driver Set Socket Adapter