Be careful to use the linear rail groove tool when installing the linear rail. Do not slide the slider and cause the balls to be lost. When self-installing, you need to ensure that the installation is aligned, that the slider can slide smoothly and the tap PCB can be triggered. When installing the Stealthburner, the upper holes of the Toolheads should be aligned with the carbon fiber threaded holes to avoid tightening the screws too hard when misaligned, causing the threaded holes to be . Colour:As Shown Material:Stainless steel+Plastic Package Contents: 1 * TAP kits 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.