4 pcs 4.8mm DLC Ball nuts   Surface Coat The surface coating is the finest DLC finish that shines luxuriously in the rainbow. Hardness is more than double that of demon and gold bar DLC, and low friction resistance is achieved at a high level. Achieves a longer life for coated pillow balls. Wide range of motion made by JAPAN for both cutting and coating To reduce friction at the joints and ball ends of the DRC to the utmost, it is machined by high-precision machining . Stainless steel is used for the material to increase strength and corrosiveness. Pillow ball, Pillow ball Both nuts are manufactured by cutting the interference part significantly to increase the range of motion of the tie rod. Achieves a large range of motion compared to other companies' products. * Tamiya type 4.8mm ball end, hard type is recommended.