The 8 1/2" Langenbeck retractor with 40x11mm blade dimensions is a surgical instrument intended for deep tissue retraction; its 8 1/2" length provides a great balance of reach and control, and its 40mm width and 11mm depth of blade offer a firm grip, perfect for reaching deeper or larger areas during surgical procedures. Because it is made of high-quality stainless steel, it is long-lasting, corrosion-resistant, and compatible with normal sterilizing procedures, making it appropriate for use in a range of surgical settings.