As someone who frequently uses industrial hand tools, I recently purchased a 21 ounce hammer from Industrial and Scientific category for my latest project. Based on my observations, this hammer from Stanley Proto J57 531 Compo Cast is of exceptional quality. The Compo Cast material is lightweight, yet durable and resistant to damage. The hammer's ergonomic grip is comfortable to hold and offers excellent control. My only complaint is the higher price point compared to other hammers on the market. Despite this, I would highly recommend this hammer to any professional or serious DIY enthusiast.