Caldercraft Model Boat Fittings 8104DW 4mm Double block. Walnut. (Pack of 10)
Sold In Packs of 10, these double blocks measure ((h) x (w) x (d)) 4.3mm x 2.7mm x 3.5mm and are available in walnut.
Equivalent manufacturers part number cross references:
Artesania AL8525
Caldercraft 8104DW