"Reducer inner square drive 10 =3/8"" ? External square output 6,3 =1/4""With ball lockSurface: ChromedDIN 3123, ISO 3316Made In GermanyDrive: Square 10 mm (3/8 inch)Output: Square 6,3 mm (1/4 inches)Dimensions / Length: 26 mmNet Weight (kg): 0.03 kgFor manual operation"