Aluminium plate 6082
1 x 71mm x 30mm x 160mm long 
Has a miss cut so lenght is from there 
6082 aluminium is a medium-strength, corrosion-resistant alloy that's part of the wrought aluminium-magnesium-silicon family. It's often used in structural applications like bridges, trusses, and cranes. 
Minimum may be longer, never shorter