Erowa Quick Chuck 50 ER-034387 Compatible 6 in 1 multi chuck. Rapid Holding Systems Erowa ER-034387 Quick Chuck 50 Compatible is 6 in 1 multi chuck on 1 bar (Screw Locking) is 100% compatible with Erowa ER-034387 Quick Chuck 50. It applies to doing slight milling or grinding work on EDM/CNC machine centers. Specifically designed to maximize small spaces with minimal investment Bar Lock Version. Manual operation, corrosion-resistant.