AM 221 (10.5 - 13'''), Balance staff, Ronda: 48
- Manufacturer Ronda no: 48
- Total length: 292
- Fits cal: 221, 270, 277 (10.5 - 13''')
- A: 292 (ronda A).
- B: 145 (ronda B).
- F: = 58 (ronda K).
- G: = 79 (ronda J).
- H: = 43 (ronda G).
Conversion: Ronda to DCN
- A = A
- B = B
- J = G
- G = J
- K = F
