Atoplee 1/4 inch Shank 6/7/8/10/12/13/14/15/17/19mm Hex Socket Magnetic Nut Driver Set Socket Adapter [6-19mm, 10pcs] Material: chrome vanadium steel (magnetic) Outside Hex shank:1/4 inch ; length: 65mm Inner Hex Shank 6/7/8/10/12/13/14/15/17/19mm Package Included: 10pcs Hex Socket Magnetic Nut Driver Set Socket Adapter