The FROST Y218 Heavy Duty Shrinker Stretcher has a Maximum Capacity of 16 Gauge Mild Steel and 14 Gauge Aluminium ideal for those more serious projects. *Colour might be different with the picture. Read \" How Do I Use the Shrinking / Stretching Machine? \" and \" 10 MUST-HAVE Restoration Tools \" from Technical Article . Features at a glance: Ideal for perfect-fit rust-repair metal work around Wheel Arches, Dog Legs, Window Edges and Boot Edges Shrinker/Stretcher Combo Set includes 2 Bodies, 2 Jaws and a Robust, Solid Ready Assembled Stand. Works on up to 18-Gauge Mild Steel, 20-Gauge Stainless, and 16-Gauge Aluminum 4 Mounting Holes Robust and Solidly Engineered Made for FROST - BUILT TO LAST !