This is the Dynamite nitro wrench. Gas R/C racers can install and remove glow plugs from their engines with ease, speed, and style with the Dynamite Nitro Wrench. The Nitro Wrench has a long, 5" shank with 8mm wrench size for the glow plug that can reach down into tall engine heat sink heads. It's chrome plated for rust resistance and good looks, and features an indestructible, fuel-proof composite plastic "T" handle. A gas pit box essential.