Caldercraft Model Boat Fittings 8107SW 7mm Single block. Walnut.
Sold in packs of 10, these single blocks measure ((h) x (w) x (d)) 7mm x 3.2mm x 4.6mm and are available in walnut.
Equivalent manufacturers part number cross references:
Caldercraft 8107SW
Disar Models DM11003
Mantua 37020