This tool is amazing! There has never been a tool that makes stamping so easy and safe for the beginner as well as the experienced. Introducing the Thumb-Safe design stamp positioner and holder by EURO TOOL, this handy tool holds round and square stamps up to 7mm while keeping thumbs and fingers at a safe distance. Simply insert stamp in round hole and tighten by turning the knurled handle - it's that easy! It also makes lining up the stamp easier because there is nothing to obscure the view of the stamping surface.