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Large Screw Depth Gauge up to 100.0 mm, 8-3/4" (22.2 cm) Large Screw Depth Gauge is a measuring tool that can be used in a variety of surgical procedures. This instrument is specifically designed to measure the depth of a hole to determine how deep it is. Additionally it is crafted to be used in conjunction with large screws. This gauage can measure up to 100 mm making it suitable for a variety of surgical applications.