... , DFU, DFI etc.Size of screw shaft: 1204, 1205,1605, 1610, 1616, 2005, 2010, 2040, 2505, 2510,4005, 4010 etc. Key ... eliminates backlashShaft precision degree: Shaft Dia/Accuracy C7C101404 1405 1605 1610 2005 25050.04 mm0.10 mm2510 3205 32100.07 mm0 ...