You may order additional diameter on any large duplex or industrial strength collar for an extra charge of $9.50 per inch of additional diameter, up to three additional inches, for use especially with larger birds and foot injuries. In order to order an additional-diameter collar, indicate the product number for the collar and then select the code for the additional diameter you wish to order on the collar you have indicated, using the additional length product number. Note: 1" of diameter equates to approximately 1/2-inch of length from nape to hemline.
