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KNRLR


http://defcad.s3.amazonaws.com/cad_images/imgs/000/504/600/large/KNRLR_exploded_display_large.jpg?1378349296

http://www.thingiverse.com/thing:21782
https://defcad.com/cad_objects/knrlr-a-tool-for-making-knurled-bolts-which-are-actually-spiky
a tool for making knurled (hobbed) bolts which are actually spiky

http://defcad.s3.amazonaws.com/cad_images/imgs/000/504/599/large/KNRLR-photo_display_large.jpg?1378349292