Specification Product Name: GDF22 Tribrach With Optical Plummet. Specification: Three leveling screws with center line. 3-prong forced centering connection Standard base screw: 5/8 Fits total stations Note: Installation guide not included, we strongly recommend you seek professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly, Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour: As Shown Material: Aluminum Alloy Package Contents: 1*Three-Jaw Tribrach Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.