This is a newer and slightly shorter Arca Swiss Style Clamp of the R10/R20 (width 30mm vs 35mm clamp).
While the clamp will fit any R10/R20 the shorter width design is compatible for use with the Samyang 7.5mm Conversion tool kit for Fujifilm X-Mount.

Plastic Insert for Lens Ring V2 for Sigma 8mm & 15mm Nikon & Pentax Mount (F6452)
Sirui W-2204 Carbon Fibre Waterproof Tripod
Dual Axis Mecha C2-E1 With NN3 MK2 (F9920)
Travel Pole 9.6'/2.9m (F7201) 
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