That's a key?? Sure is! This Allen wrench has an aluminum handle that offers a low profile and is knurled to ensure a secure grip. Use the Allen wrench to tighten and loosen the jaws on any GRS® engraving block (except the MicroBlock). Its low profile (extends only 1-1/4" from the block) allows you to leave the key in the block for quicker adjustments and exchanges while you work.