Hydraulic Claw Kit Build your own hydraulic lifting claw that really works! Experiment with other hydraulic projects and activities in the exclusive Tinker 'Zine magazine. Includes a step-by-step video tutorial link, illustrated blueprint instructions, all the materials, and a special-edition Tinker Zine magazine. Winner of Dr. Toy's 100 Best Children's Product Awards, Kiwi Crate develops hands-on projects and activities designed to spark children's curiosity and creativity.