DOG BONE™ 8-in-1 Metric wrench. METRIC: 12, 13, 14, 15, 16, 17, 18, 19mm. Go-Thru swivel head allows easy access and fits any angle. Built in 8-lb magnet serves as oil drain plug or nut holder. Cr-Mo 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.