This style collar does not have an adjustment piece or a quick-release snap like our other styles.  However, it has a very convenient "slide" buckle that does not slip once it is closed.  It does not require holes in the collar, so it can be adjusted to any size. The 3/8" width collar is 15" long and the 5/8" width collar is 20" long.  If the collar is too long, simply cut the excess nylon off and heat the end of the collar with a lighter to seal the material.  These are offered in plain or jeweled styles.  The jewels are 1 solid piece sewn to the collar.