cat_no size diam length price
 C322    6    3    20    0.14
 C332    6    3    30    0.16
 C342    6    3    40    0.20
 C422    8    4    20    0.32
 C432    8    4    30    0.51
 C442    8    4    40    0.61
 C522   10    5    20    0.51
 C532   10    5    30    0.57
 C542   10    5    40    0.78
 C622   12    6    20    0.94
 C632   12    6    30    1.08
 C642   12    6    40    1.30