WirthCo 20109 Battery Doctor Knife Switch for Top Post Batteries Switch opens and closes horizontally Ideal when clearance above battery is limited Features post with a 5/16 inch to 18 inch stud and wing nut for extra connections Switch dimensions: 3.5 inches wide by 3.75 inches long by 2.5 inches high For over 30 years, WirthCo has been a prime manufacturer of practical products for making life easier and safer