Lang Springer fork Bearing Adjusting Tool can adjust the steering stern adjuster nut to allow for proper neck bearing endplay. The Lang Springer fork Bearing Adjusting Tool is a three-prong socket, 3/8” drive, with a pass through hole in the center that allows for precise neck endplay adjustment. The Lang tool is used on Harley-Davidson® motorcycle Springer® forks, and is heat-treated and black oxide plated for durability.