Just slide it on the rear axle and pull on the handle to turn the engine over (We recommend taking the spark plugs out first). The ratchet end lets you turn the engine over without having to take the tool on & off the axle. You can do this with the car up on stands, while other crew members are doing maintance on the car. Features include black anodized splined center, teflon liner to prevent wear, red anodized head, and black anodized aluminum handle.