For FORD F250,350 SUPER DUTY. THESE ARE THE BEST INTERNAL LOCKING PLIERS YOU CAN BUY! And not just for money. They don't flex with the excessive force required to remove the crazy thick locking ring. The tips are firm, slightly curved and the diameter of the tips is perfect for the ring's holes, allowing you to safely squeeze the ring without fear of it slipping off to get a huge bloody blister. I RECOMMEND THIS ABOVE SNAP ON, MAC ETC ETC ETC. GREAT!