This is a premade harness. Our harnesses are a 2 in 1 product - meaning it can also be used as just a collar by unbuckling and removing the collar portion from the harness body. The body of the harness and the collar section have D-rings. 
Please note harness measurements on tag in picture. 
 
This is a premade item. The item pictured is what will be shipped to you! 
Want it in a different size? Place a custom order using this listing: Custom Collar
 
All martingales come with a tag holder. 
A buckle collar refers to a plastic quick release buckle.