The adjustable semi-slip collar has no buckle or holes.  It has an adjustable slide to suit different head sizes. Once the collar is slipped over the dogs head you adjust to a comfortable fit. The purpose of a a semi slip dog collar is to allow the collar to tighten to prevent a dog backing out, whilst being loose when a dog is not pulling. 

With no buckles to give or break, and designed to be slipped over the head, these collars can endure tough pulling. Stronger than leather or chain collars and minimizes wear on your dog's coat. Very popular with Siberian Husky and Alaskan Malamutes due to the strength and durability of the collar. 
This is not a choke collar