Size: 3/4"Long Arm Length Range: 7.156" - 7.344"Short Arm Length Range: 2.031" - 2.219"Material: Hardened Alloy SteelA Hex Key Is A Six-Sided Shaped Bar Bent At A 90 Degree Angle At One EndDesigned To Be Inserted Into A Like-Sized, Hollow Recess Of A Socket Screw To Manually Tighten Or Loosen The FastenerEither Side On The Key Can Be Used For Convenience