DV8's JKBLJNT-01 is designed for rugged off-road use. DV8 uses SAE4140 chromoly steel studs and SAE1045 steel housings to make one of the toughest ball joints on the market. These ball joints are also greaseable which allows for standard maintenance and increased longevity. The grooves on the side of the housing are closer together resulting in superior resistance to turning that can occur and also helps makes the install easier. Details: SAE4140 and SAE1045 steel, Greaseable, 1-year limited Warranty, For Jeep JK Dana 44, Front and Rear.