1 or 4" (6.35mm 6.3mm) hex shank to 4mm 4 mm socket driver bit adapter for precision (system 4) hex bits magnetic holderHas a magnet to hold 4mm micro or precision bitsApprox 25mm (1") long, so doesn't wobble like the longer bitsFunctionally similar to the Wiha 75802 adaptor but not identicalProduct DescriptionA micro bit 1 or 4" insert adapter for standard 1 or 4" drive tools.Note that this is a precision bit holder meant to be used with precision bits and not a power tool bit. It is meant for delicate work, not high torque applications.Uses magnet to hold 4mm micro bits- 1" long - so it is a short bitPackage includes:Only 1x bit adaptor. No packaging or other items are included in this sale. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.