Balancer

Thanks for writing in. This looks like either a Series 380 or Series 385 Channel Balance. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need to confirm the length of the metal channel, not including the nylon fittings at either end, to determine the right length to select. Finally, you will need to select a stamp option. Look on the metal channel for a stamp code that matches one of the stamp options on the product page. If you are uncertain, weigh your window sash. You can then match that exact weight with one of the stamp options listed on the product page.