DOG BONE 8-in-1 Wrench. Fits 8 SAE socket sizes: 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, and 13/16 - inch. Go-Thru swivel head allows easy access and fits any angle. Built in 8-lb magnet serves as oil drain plug or nut holder. Crv Steel for strength and durability. Ideal for oil drain plugs. Triple chrome plated with full polish finish makes The DOG BONE easy to clean and corrosion resistant. Cam-Lock 6 pt. socket system provides larger contact area and will not strip bolt or nut heads.