This set is made from durable tool steel. It won't get out of shape anytime soon. Here are my comments: Comes with a good sheath although putting all the rings back is a hassle. The ratchet handle works efficiently and does not slip. For most US conversions, like the SBC 350, you only need a ring that fits 4 1/8 inches. So far this has grabbed the piston well too. However, insertion into a cylinder requires little dexterity; don't do it first. Squeeze the ring tightly. Leave it tight as youβ¦