Grinding Angle: 0° - 60° - Whether you're working on stainless steel, aluminum, or exotic metals, the StaySharp Pro offers unrivaled versatility and accuracy, allowing you to customize your grinding angle to suit specific welding applications. Rotational Speed: 5000 r/min - The StaySharp Pro ensures that your tungsten electrodes are sharpened with remarkable efficiency, allowing you to maintain optimal welding performance. Compatible Tungsten Electrode Diameters: 1/16”, 3/32”, 1/8”, 5/32”, & 3/16” - Whether you're working on TIG welding projects with thick or thin electrodes, the StaySharp Pro ensures that your tungsten electrodes are precisely sharpened for optimal welding performance. Comes with 3 tungsten collets: 2.4mm (3/32"), 3.2mm (1/8"), 4.0mm (5/32"). The 2.4mm (3/32") collet can be used for 1.6mm (1/16") tungsten electrodes. Diamond grinding wheel included Limited 1 year manufacturer warranty