Fits many PetSafe containment collars.Our own strap with upgraded materials... 3/4" Width High-Quality Nylon Strap Heavy-duty black "snap-lock" buckle Unique curved design of buckle provides added comfort for the pet and convenience for the owner Collar adjusts to fit neck sizes up to 26 inches. Comes with 2 pre-cut holes. Available in Red, Black, Royal Blue, Purple, and Neon PinkComes standard on the Petsafe PUL-250, PRF-275-19, and PUL-275. Also works with many other PetSafe containment collars.