Stamp option on channel balance

A home owner from San Diego says:
July 25, 2020
Not sure which strength to purchase. Channel says 21 5 IR CALDWELL
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Tom from SWISCO responded:
July 28, 2020

A stamp of 21 5 usually corresponds to our "2150" stamp option. If you have any doubts, you can always weigh your sash and refer to the chart on the S385-22 store page to confirm.
22" Series 385 Channel Balance
22" Series 385 Channel Balance
S385-22
$9.59
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