Specification:
ER11-ER11: Outer thread M14*0.75, Inner thread M14*0.75
ER11-ER16: Outer thread M19*1, Inner thread M14*0.75
ER16-ER16:Outer thread M19*1, Inner thread M19*1
ER16-ER20:Outer thread M25*1.5, Inner thread M19*1
ER20-ER20:Outer thread M25*1.5, Inner thread M25*1.5
ER20-ER25:Outer thread M32*1.5, Inner thread M25*1.5
ER25-ER25:Outer thread M32*1.5, Inner thread M32*1.5
ER25-ER32:Outer thread M40*1.5, Inner thread M32*1.5
ER32-ER32:Outer thread M40*1.5, Inner thread M40*1.5
