(SMBB1626/SMBB2026 /SMBB2526：used on SPB26-2/3/4/5
SMBB2032/ SMBB2532 / SMBB3232 ： used on SPB32-3/4/5
NOTE：SMBB2026：
"20" : width of the holder touching the lathe tool"
26" : width of cutting broadand so on
 
SPB326-S ：
"SPB" : cutting broad name"
SP" : one end cutting insert
"26" : width of cutting broad"
3" :width of cutting insertsand so on )