Description: Set of M6 negative (6mm thread) + M6 positive (8mm thread) terminal rail terminal blocks 12 to 48 Rated up to 150 amps Provides a neat solution for electrical wiring. Base made of reinforced fiberglass nylon for strength and durability. Heavy duty pins allowing up to 150 amps (rating determined by the wires). Specification: Material: Nylon, Glass Fiber Reinforced and Metal Size: about 15*11*4cm Size: Red M8 (5/16"), Black M6 (5/16") Maximum working age: DC 48V Package includes :Single Terminal Block 4pcs Screws Note:* No installation tool and no instructions, professional installation is recommended * Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow 1-5mm deviation due to measurement manual.Thank you for shopping. Have a nice day!