The bus bar is measured (L x W x H): 138 x 69 x 44.5mm (5.433x2.72x1.75inch).Stud size: M8 (5/16inch). Surface screw fixed installation, four mounting holes make this terminal block easier to be mounted in any orientation. Bus Material: The battery distribution block is made of High-quality materials, which has good electric conduct performance and sturdy rust-resistant.The base is made of High-quality materials base reinforced to protect your safety, ensures great mechanical strength and durability.Non-slip sponge under base, increased Stability. The power distribution block With four removable side plates, a insulated rear cover, that's designed to withstand rain and dust, resist the air and seawater erosion. RV terminal blocks surface screw fixed installation, four mounting holes make this terminal block easier to be mounted in any orientation.Removable windows for unobstructed wiring. The Junction block is widely used in 12V-48V auto marine, boats, Trailers, trucks, RVs and so on. Material: Stainless steel + plastic colour: black+red Package Contents: 2 x cable box 1 set screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.