Since it is a left-hand blade specification, please use it with reverse spindle rotation & climb cut .
  Please confirm in advance that the bottom of the finished hole with  end cutting edge is permissible in the machining instructions because it has a different shape from a normal drill.
  The bottom shape of the finished hole is as shown in the figure below.
 Please confirm in advance that it is acceptable. 
 

(FAQID:9095)