Radial / Ulnar D-HandlePre hab, re hab or strength condition your radial ulnar movements with a classic D handle! Unlike the O handle, the half circle design here provides unrestricted movements for bending at the radial ulnar points of the wrist. Although the D handle can be used for pronation and supination work, it's recommended to opt for the O handle for full pronation supination range and smoothness. Very popular with armwrestlers but also very useful for other sports