3/8 inch Spiral Tilt-In Window Balance Rod with Blue Bearing and Double Pins.

The colored bearing denotes rod strength. (See 4th Image)

Balance has double end pins, one locks into the balance shoe and one is for adjustment.

Rod Length: Varies - Choose Your Length
Rod Weight: Varies Per Length, Up to 30 pounds
Rod Diameter: 3/8 Inch
Blue Bearing
Application: Tilt-In Window
Tube Color Options:
Aluminum: sizes 10-25
White: sizes 10-25 (4-6 week lead time)
 

Please measure rod length from end to end of the metal tube and specify the needed length.

Resources:
Guide: HOW TO ADJUST A SPIRAL BALANCE ROD
Video: HOW TO REPLACE A SPIRAL BALANCE