Tested Mailbag time! This week, Will and Norm open the package to find strange steel pieces. But when we realize what these are, we couldn't be more excited. They're grappling hooks! Thanks to Garth for sending this awesome mailbag! Find out more about his project and Kickstarter campaign here: https://www.kickstarter.com/projects/bigtreehouse/grappling-hooks-makerspace-and-therapyspace