I love these new tungsten carbide tip three inch dividers! Made in the USA, these dividers are very sturdy and precise so they won't flex on you and give consistent, repeatable measurements when marking your work. The legs are rounded on the outside and ground flat on the inside as they taper down so you can mark down to 0.5 mm. The tips have tungsten carbide inserts for toughness and a very long working life, more durable than steel. Tips are also precision ground and very sharp. Perhaps best of all, the knurled opener rotates smoothly and precisely for easy and fast use. I hate using clunky, hard to operate dividers and these are smooth as can be!