This is a component of the Free Universal Construction Kit, a collection of adapter bricks that enable complete interoperability between a wide range of popular children’s construction toys. By allowing any piece to join to any other, the Kit encourages totally new forms of play across otherwise closed systems. As with other grassroots interoperability remedies, the Free Universal Construction Kit implements proprietary protocols in order to provide a public service unmet, or unmeetable, by corporate interests.This is adapter uck-00f07m, which joins Duplo® to Tinkertoy®.Complete information about the Free Universal Construction Kit can be found at http://fffff.at/free-universal-construction-kit. The Free Universal Construction Kit was conceived and developed by F.A.T. Lab and Sy-Lab in partnership with Adapterz LLC. Complete information about the Free Universal Construction Kit can be found at http://fffff.at/free-universal-construction-kit.The Free Universal Construction Kit is licensed under and subject to the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported license ( http://creativecommons.org/licenses/by-nc-sa/3.0/legalcode ).Lego®, Duplo®, Fischertechnik®, Gears! Gears! Gears!®, K’Nex®, Krinkles®, Lincoln Logs®, and Tinkertoy® are trademarks of their respective owners. The Free Universal Construction Kit is not associated or affiliated with, or endorsed, sponsored, certified or approved by, any of the foregoing owners or their respective products.WARNING: CHOKING HAZARD -- Small parts not intended for children under 3 years!