https://www.mecanumeric.com/eshop/categories/38---38-70-73-220/milling/milling/consumables/tools/aluminium/detail308-lmt-belin-milling-cutter-for-gda-aluminium/

Milling cutter for machining GDA aluminium - Cutting Ø: 4mm / Shank Ø: 4mm / Overall length: 50mm / Useful length: 6mm - REF = GDA040.