WirthCo Battery Doctor Side Terminal Battery Wrench is designed for installing and removing OEM 5/16 inch side terminal bolts. The reversible ratcheting wrench features an easy grip handle. It fits all standard side mount bolts. The overall length of the wrench is 5.25 inches. For over 30 years, WirthCo has been a prime manufacturer of practical products for making life easier safer. California Prop 65 - Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.