With a plain handle, the hex key has an overall length of 5/8".
The 3 3/16" arm length gives you better leverage when tightening or loosening nuts and bolts. It is ideal for working with bolts and screws in tight spaces. The alloy steel blade of the hex key offers superior durability and strength. SAE Plain Hex Key, 5/64" Tip Size, 3 3/16 in Long, 5/8 in Short If you need a hex key for your work, this Proto J46205 Hex Key is the one to get.