About this 3D model

http://bunkai.sakura.ne.jp/bunkai-wp/3d_printer/644/ "1/4" & 6.3sq(6.35mm)??????????????????????? PRN3D???????????????????????????? ??????????????? It is a grip handle to be used for socket "1/4" & 6.3sq of (6.35mm) standard. Has been created to facilitate the adjustment of the level of heat bed PRN3D. It is a part that can be used for general purposes.