Tender For supply of boring holder right hand shank dia 20, min bore dia 20, oal-200 with insert dcmt 11 s20r-sducr 11-20 , boring holder left hand shank dia 20, min bore dia 20. oal-200 with insert dcmt 11 s20r-sducl 11-20a , insert dcmt 11t308 mt tt5080 , insert dcmt 11t304-ps for steel machining, job hardness 45-50 hrc