Manufactured from sustainable cultivated forests, the sipo tenons are tough and the ideal choice when you need extra strength or tenons for outdoor applications. They are mold and insect-resistant, and are stronger than biscuits, and won't slip or turn like common dowels. Festool domino tenons ensure perfect alignment and tight fitting joints every time.
Sipo, also called utile, has mechanical properties similar to white oak. These sipo dominos are reddish or purple-brown heartwood is rated as durable by the USDA Forest Products Laboratory.