Tube clamps are for the Takahasi 130d.
The clamps are designed for the Primalucelab Vixen dovetail 240mm. In addition, 4xM6 fusion thread, 16xM4 fusion thread, 4xM6x25mm cylinder head screws, 16xM4x10mm countersunk head screws, and 4xM6x16mm cylinder head screws are required.