Maxsales_2009 4PC 3/8″ UNIVERSAL SPARK PLUG SOCKT SET Heat treated chrome vanadium steel.Mirror Polish and Chrome plated.Fit 4 most popular spark plug sizes: 3/4″, 13/16″, 5/8″, 9/16.Rubber Insert to hold spark plug.. UNIVERSAL SWIVEL FEATURE FOR HARD TO REACH ENGINE SPACES. Shipping Information:All package will be inspected before shipping. Protective packing material will be added in your package if we believe item can be damaged easily in transit. Please allow 1-2 business days handling time for payment processing and shipping. Tracking numbers will be available in 24 hours except weekends and holidays. For faster service, please update your correct shipping address before sending payment. Please contact us if you have any questions on shipping. Terms of Sale:100% Satisfaction Guaranteed or your money back. All exchange items must be in 100% brand new condition. Buyers are responsible for return shipping. Items must be returned by the same method use for delivery. All returns will subject to a 20% restocking fee based on there invoice price