The file 'Anet A8 Spool Holder / Adapter (51/52 Mm Diameter) 3D Printer Model' is (STL) file type, size is 30.4KB.
Adapter for 52 mm diameter shaft spool filament.It fits well with spool holder redux: http://www.thingiverse.com/thing:1743397
UPDATE: Added a 51 mm diameter version.
