Spec
- Size (S1xS2; inch): 1/4 x 5/16
- Small diameter of spanner portion (D1; mm): 13
- Large spanner area (D2; mm): 17.5
- Small thickness (T1; mm): 4
- Large thickness Spanner (T2; mm): 4
- Total length (L; mm): 107
- Mass (g): 18
https://www.axel-gl.com/en/asone/d/61-3853-18/