these flat recess dimple dies are printed out of solid steel. The inner diameter is and the depth of the step is These have threads so they can be used with our hydraulic installation tool. They can also be installed with a hydraulic press.
Origami is a little tricky for them because they don't have the dexterity, but with a little help they made origami bookmarks and christmas trees as an activity. They had fun with it. Folded Paper Heart Book Page Marker – DIY