Designation Description Page External tool holders 1246 SER/L External tool holders 1248 SER/L U Internal tool holders 1250 SIR/L Internal tool holders 1252 SIR/L-U Solid carbide threading bars for high rigidity 1254 SIR/L C-type Solid carbide threading bars for high rigidity 1255 SIR/L-U C-type 1244