Features 1、Adjusta Focusing Mechanism: 50mm Industrial microscope focusing bracket features an easy to use large focusing knob on both sides, allowing an lifting range of 40mm. 2、Scope of Application: Standard size focusing bracket, suitable for lenses with a diameter of 50mm, with a bottom screw hole size of M6 for easy installation. 3、Enhanced Stability: Designed for single travel focusing, this bracket provides a secure support structure for accurate and stable microscope operations. 4、Durable Construction: Microscope focusing rack adopts aluminum alloy material, high hardness, ensuring long lasting performance and reliability for your microscope setup. 5、Simple to Use: We only provide focusing brackets. It's not a complete system, easy to install and disassemble, no complicated operations, convenient for using. Specification Item Type: Microscope Focusing Bracket Material: Aluminum Alloy Lifting Range: Approx. 40mm / 1.57in Bottom Screw Size: M6 Compatible Lens: Approx. 50mm / 1.97in Package List 1 x Industrial Microscope Focusing Bracket 1 x Special Wrench