It took me a while to find the pic, but here are 3 different tips, the first 2 are for a 25 watt Weller Iron, the third is a 40 watt tip. The first shows what happens when you grind the coating off a tip. At one time it was pointy like the 40 watt tip, and as long as the original 25 watt tip. The pic doesn't show it, but the ground tip is about 1/4 inch shorter than the unground one.