3M 7100172051 is a medium-sized, half facepiece reusable mask suitable for welding applications. It offers enhanced comfort with its silicone faceseal and four-point harness. The connection type is secure click, ensuring a tight fit. While it does not come with accessories or a clip-on welding shield, it does provide spare parts and a speaking diaphragm. The mask is durable and lightweight, weighing only 178g. It features an exhalation valve for easy breathing and is made from high-quality silicone and nylon materials. Overall dimensions are 138mm in height and 125mm in width.