EROWA ER-019424 Compatible Horizontal and Vertical Manual Chuck includes two pre mounted Erowa ITS 50 Manual Chucks compatible. Rapid Holding Systems branded Erowa ER-019424 is useful because its attaching 1 or 2 chucks in horizontal and/or vertical position. Square block chuck system Fits ITS chucks, QuickChuck 50 and/or QuickChuck 100.