the tool ( SBHA) can be used on straight shank, for example :
      boing bar,  u drill,  twist drill,  center drill  and  extension rod
 
       Eg: SHB 16 - 3/4/5/6/7/8                  Bushing OD: 16mm , ID: 3/4/5/6/7/8mm
             SHB  20 - 3/4/5/6/7/8/10/12       Bushing OD: 20mm , ID:3/4/5/6/7/8/10/12mm

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