This serrated riser block lifts up RM stopper 28 mm, RM serration is both at the bottom and the top of the block. Additional RM T-nut and longer bolt are included, so stoppers like RMS-S, RMS-R etc. will work directly on this riser block. You can use the bolt and T-nut form the original stopper in the "front" hole of the riser block.
Additionally, quick setup plate PBQ-S1 and any B-series clamp can be used with the base riser unit.
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