buy from the seller –

https://www.mn-modelar.com/77propeller-v52777.html

http://www.modelshop.sk/shop/goodslist/naradie?group=402&tree=402&rtree=339

https://www.prospektor.sk/znacka/77propeller/

https://www.aviationmegastore.com/?action=uas&form_publisher=3997

Material – wood

Diameter of one shaft  – 21 mm