This Lanparte Right Angle Clamp offers a wide range of uses. The vertical space between holes is 30mm, so the sideways rod will be either 30mm below or above the rods (depends on the clamp's orientation).
When you are using a 15mm rig, you might need to put a rod at right angles to the main rods. This could be to mount an additional devices or a front crossbar for wide grip handles.
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