Heavy duty 500A , insulated, compact fuse block with corrosion resistant 5/16” studs. Secures to the surface with two #10 flat head screws or bolts (not included). Clear lexan cover insulates the conductive parts. Accepts industry standard ANL tin-plated copper fuses, purchase separately. 80-500A ratings. See through mica element in the fuse body for easy identification of a blown link. Case Sizing: 6.25” x 3.00” x 2.00”