21" Channel Balance Stamp 21 c

A stamp of 21C usually corresponds to our 2130 stamp option for our 1/2" wide 22" long channel balances. You should triple check the length of your metal channel to confirm what size it is you're dealing with.

You can also see a detailed chart on each balance store page that tells you exactly how much weight each stamp option supports. When in doubt, you can always weigh your sash and refer to that chart.

If the channel is exactly 21-1/4", you can use the S372-21 balance with a 2030 strength option. 

If you're not absolutely sure that the S372 is an exact match to your fittings, I would recommend sending photos of your original balance uninstalled for us to confirm the correct match. 

Your 3/8" channel and combination of attachments remind me of the S810-22 balance with a 21C strength option. Take a look and see how the specifications compare.

You can also find our full return policy here. Thanks for posting!