Features. Top Post Knife Switch With Stud. For Top Post Batteries. Low Vertical Operation. Switches Recommended To Mount On Negative Battery Post To Disconnect Ground Battery. Easy To Reach Operate. Stud Wing Nut For Extra Connections.. Dimension – 2.75 x 4.5 x 7 in.. Item weight – 0.7 lbs. California Prop 65 – Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.