Window spiral tilt

A quick learner from Maryland says:

Hello , I am looking to buy and I was wondering if my windows spiral till is series 600? I've attached pictures with this message. Thanks so much! The length of the tube is 25 inches.

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Bob from SWISCO responded:

Hello there. It does like like the spiral balance is at least 1/2" in diameter, which would indicate the Series 600; but I highly advise removing the spiral balance from the window to obtain as accurate a measurement as possible, just to be safe! If the metal tube is 5/8" in diameter, and if the length up to but not including the colored tip is 25", then the S600-25 is what you're looking for. 

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