The Linear Slider Kit 3 from RigWheels includes 6 RigWheels, 1 RigPlate, and 1 RigAxel to make a captive rail linear slider. The dual carriage configuration makes your camera more secure by locking it onto the rails. This setup also allows you to position the carriage / rails at any angle, which is just the trick for vertical or slanted moves. However, the kit is not suitable for handling vertical and angle movements.
This camera slider kit is designed for easy expansion and multifunction use, and allows operation on smooth flat surfaces (such as a counter top or glass table). The camera dolly wheels will run on any smooth rigid pipe with an outside diameter between 1-1/8" and 2". This kit also allows you to achieve a variety of movement styles.
RigWheels are mounted to the RigPlate with common 5/16" or 8mm bolts. When the RigWheels are removed, the flat 5/16" thick RigPlates can fit in many common places like a laptop pocket. The 6 RigWheels packed into their included travel bag are about the size of a portable hard drive.