It can be directly inserted into the aluminum slot hole of any mounting point. Profile connection is one of the most used accessories. It is used for T-slot aluminum extrusions to connect other parts and be connected with T-screw or others. T-Slot nuts allow the user to add clamps to a device without knocking down existing clamps. Color: Silver material: metal Size: 30mm Specification: M8 Package contents: 10 * T-slider Only the above package, other products are not included. Note: shooting light and different screen may cause the item’s color in the picture a little different co.ukom the real thing. The allowable measurement error is +/- 1-3 cm.