Caldercraft Model Boat Fittings 8107SN 7mm Single block. Natural.
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 natural boxwood.
Equivalent manufacturers part number cross references:
Artesania AL8515
Billing Boats BF699
Caldercraft 8107SN
Corel AMNB104
Mantua 37021