Manufacturing material: This product is based on fiberglass-reinforced nylon, which has excellent mechanical strength and durability. The base is made of flame-retardant plastic and is less sensitive to temperature extremes. The bolt's insulating base design also eliminates voltage leakage from the vehicle or hull. Current and voltage: maximum operating voltage: DC 48V, rated at 80A; Maximum amps per circuit: Determined by connected wiring. Red is positive / black is negative. Item size: Battery terminal size is about 4.5 x 4.4 x 3.2 cm, screw size: 1/4" (M6). Wide range of applications: Terminal bolts are suitable for vehicle tuning or battery conversion. Suitable for 12-48V automobiles, cars, trucks, trailers, boats, RVs, cars and other industrial equipment. A high performance cable that can be used to terminate one or more connections. Package Contents: Heavy Duty Cable Bolts: M6 (1/4") black * 1, M6 (1/4") red * 1, mounting screw * 4. Surface Bolt Mount - Two mounting holes for easy mounting in any orientation.