Channel Balance 14 5 K Caldwell

With this combination of attachments, you could have either a S380-15 or S385-15 channel balance. You need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need a 1450 spring strength option for your balances. 

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Comparison of the S378, S380 and S385 balance shoes.