ABUS 158KC45 combination padlock with resettable code. Override key AP051 allows the padlock to be opened to identify the combination if unknown or lost.
Dimensions

 
						| a | Body width | 45 mm | 
					| b | Horizontal Shackle Clearance | 20 mm | 
					| c | Vertical Shackle Clearance | 25 mm | 
					| d | Shackle diameter | 6 mm |