Made by TowSmart, this kit provides 3 levels of locking protection. 
 
Features:
1. Trailer coupler lock 
- Protects your trailer from being stolen when it's not in tow
- Ball fits most 1-7/8", 2", and 2-5/16" ball couplers
- Multiple locking positions accommodate most coupler contours and latches
- Fits surge-marine couplers, latch-style couplers, and couplers with an extra ring
- Spring-loaded lock automatically returns key to locked position
- Bright red shackle provides a visible theft deterrent
- Durable steel construction with corrosion-resistant chrome finish
 
2. Bent-pin-style trailer hitch receiver with lock:
- Used in place of standard pin and clip to prevent theft of ball mount or hitch-mounted accessory
- Secures your bike rack, cargo carrier, hitch cover and other accessories to your trailer hitch
- Solid steel pin with chrome plating is corrosion resistant
- Plastic cap covers key slot to help prevent corrosion in the locking mechanism
 
3. Padlock-style coupler lock:
- Secures your ball mount or hitch accessory
- Pin lets lock fit most couplers
-  Brass construction with chrome-plating is corrosion resistant
-  4 Square keys included