It’s classified by many models: 

10/16, 15/16,20/16,10/20,20/20,10/25,15/25,20/25,10/30,15/30

Which means the load capacity are 1000,1500,2000, the maximum lifting height is 1600,2000,2500,3000 respectively . The forks clearance from the ground are 80-90mm.

It’s very convenient for people to drive it while standing on the footboard.