The double-threaded wood screw joint with collar has an internal thread and an external thread with no cuts. The nut is screwed into the wood with an Allen key. The furniture tab is normally used to obtain a metric thread in a wooden board in a drilled hole. The screw has been galvanized, therefore it is a durable and corrosion-resistant product. Technical data Material: Steel, yellow galvanized M8 internal thread: 6mm Length: 20mm https://elecena.pl/product/22624070/m6x20mm-double-threaded-wood-joint-10-pcs-furniture-tab-screw-nut 2023-02-23 https://elecena.pl/product/22624070/m6x20mm-double-threaded-wood-joint-10-pcs-furniture-tab-screw-nut 2025-10-28