Features copper shells machined from solid bar stock (not tubing). Thick shell flange. Extra heavy-duty shell end where the tip takes the most abuse. Larger diameter decreases preheat time and maintains the cut on painted or rusty plates. Course INV IN splines cut better, resist clogs and makes cleaning easier. Tips fit Forney 1680, 1702, 1705, 1707 and 1753 Torch Kits and Victor compatible equipment.