The diameter of this Hornet firm and comfortable tattoo machine grip is 40mm. Hence, if you are a tall tattoo artist with a big and strong grip, the product will be perfect for you. Anyway, despite the size of the 40mm black grip, it’s really comfy to hold. It resembles the feeling of drawing with a real pencil. The Hornet 40mm black grip is of high quality and durability to serve for years to come.