The file 'Special Washer For Inliner / Inlineskates – Holds Hex Bolts 3D Printer Model' is (stl) file type, size is 5.9KB.
A Washer with a hex nut and a recess for a hex bolt specifically for Inlineskates. It holds one side of the bolt (with the hex end) in place so i doesnt turn, when you fasten the other side.