Dowels

A cylindrical piece of steel, either smooth or threaded used to hold stone in place. Dowels can be set in sealant, mortar or epoxy
Found on http://www.masoncontractors.org/aboutmasonry/masonryglossary/

Dowels

Cylindrical pieces of wood useds as pins for securing joints.
Found on http://www.woodworkersuk.co.uk/blog/carpentry-and-joinery-glossary/carpentr

Dowels

Straight metal bars or rods used to connect two sections of masonry or masonry to other materials.
Found on http://www.selectstone.com/architectural-resources/stone-glossary/

Dowels

these are wooden pins used for reinforcing wooden joints.
Found on http://www.jardinesjoinery.com/2012/06/jardines-joinery-cheshire-glossary-o
No exact match found