M3x16 ISO 4762 HEX Socket Head Cap Screw
Beam coupling. Input shaft: 5mm. Output shaft: 5mm. Used in the Prusa i3 3D printer
Merge pull request #27 from Obijuan/master

More stuff for the Prusa i3 Hephestos 3D printer: M3x16 bolt and 5mm - 5mm coupling