Combination padlock

Student's lock
With four wheels and one master key
Can be opened by key or combination
Each lock with serial number
Same key to work for all locks
Spreadsheet with all serial numbers and lock serial numbers
Code: resettable
Material:
Shackle: steel
Cylinder, housing, code wheels, and escutcheon: brass
Finish:
Housing: varnished
Code wheels: nickel coating
Shackle: chrome plating
Weight: 257g
Packing: double blister packaging, 12 pieces per box, 8 boxes per carton
Carton size: 40.5 x 31.0 x 15.5cm