What is the maximum Lot size i can bid for single trade in copper mini? I read in the contract details as 70 MT what does it means?

I want to know the maximum buy or sell lot for one transaction for copper mini.

I guess you saw this on the contract specification on MCX. 

Though as per contract specification, you can place 280 lots ( 250kg is 1 mini copper, so 1 MT = 4 lots, 70 MT = 280 lots).

But however since there is a risk of execution, how many lots you can place in a single order is actually determined by the broker. So for example, we at Zerodha allow you to trade 100 lots of Copper mini at one time. 

And what are the restriction on copper mega lot ?