Craftsman 3/8" Drive 4 Piece Spark Plug Socket Set, 9-34504 Suitable for both personal and professional use. Highly durable, ensuring years of reliable use Offers versatility with sizes that are compatible for numerous lawn mowers, leaf blowers, weed trimmers, motorcycles, cars, and pickup trucks Includes the following sizes: 5/8", 13/16", 3/4" and 18mm. Standard impact. Six contact points on each spark plug Easy-to-read markings, guaranteeing use in dimly lit and grungy garages and work sites Backed by Craftsmans Lifetime Guarantee