Insert the blade into the plastic grip (included), then screw the grip to a Tube Cap v4 (not included), and connect the cap to any of your tubes. For most of my shots, I use this blade on top of a black tube. If you plan to use it on a regular basis, I strongly recommend that you crazy-glue the blade to the grip (it gets loose over time). I don't recommend using this for close up portraits as there are more suitable tools available including the Liteblades by Patrick Rochon (which also ships from our studio)
*This is an item for advanced users. If you are new to this, start slowly with basic tubes.