Lightweight quick-release adapter made of magnesium alloy, offering excellent vibration absorption and corrosion resistance. This belongs to my father, and I don't know the detailed specifications. - Brand: Velbon - Model: QRA-67L SHOE - Material: Magnesium alloy - Weight: Lightweight - Features: Excellent vibration absorption - Corrosion Resistance: Excellent corrosion resistance Although it is new and unused, please understand that it has been stored at home before purchasing. Thank you for looking.