Features:
Spindle conicity standard:DIN69871
ER collet chuck set with ER  collet with flexibility used for gripping cutting tool ,drill bit ,draw bolt and so on .
When using ,nut should be clamped tensed firstly with cutting tools then locked int the main body.
Always use the recommended wrench or spanner,unless,there might cause damage of cutting tools.
The spanner,pull stud chuck must purchase alone.