Caldercraft Model Boat Fittings 8112VBW 12mm Violin blocks. Walnut.
Sold in packs of 2, these walnut violin blocks measure ((h) x (w) x (d)), 12mm x 7.9mm x 4mm.
Equivalent manufacturers part number cross references:
Caldercraft 8112VBW
Corel AMNB142
Disar Models DM11016
Mantua 37142