This is the AKA Racing Double Play Nut Driver, with a 5.5mm and 7mm driver. The Double Play nut driver creatively lightens your toolbox by putting a 7mm and 5.5mm wrench in one! The 7mm driver fits metric wheel nuts found on most popular 1/10 buggies and short course trucks, while the 5mm driver is common for shock nuts and most nuts on metric 1/8 cars. The machined aluminum handle and sleeve provides weight reduction over standard steel tools with the added durability of a hard anodized finish.