EROWA Compatible ER-034387 Quick Chuck 50 with 6 inch extension rod. Rapid Holding Systems premium EDM Tooling Quick Chuck 50 of size 167.2X56X56mm with 10 inch extension rod is equivalent to EROWA Compatible ER-034387. Version-System size 50, manual, corrosion’resistant. Attachment: 4 x M8 from the rear or 4 x M6 stud bolts with nuts. Application-On EDM/WEDM centers for light milling and grinding work. Max. revolutions on rotating axes 2000 rpm. Note- Clamping power up to 4000 N.