This is the Artesania 8513 Single Blocks 5mm

Ship model accessories are essential when you are decorating or building any ship model from scratch. Likewise, they are essential due to the loss or breakage of a part during the construction process. Single blocks are one of the most demanded accessories as they are a fundamental part of rigging construction, they are used to guide the threads through them. This is the case of the single block in boxwood with a length of 5 mm (20 Units), made by Artesanía Latina. Provide more security to the sails of any miniature naval replica with the single blocks!