Our Collar Fits Perfectly on These Models Such As: PetSafe( UL-250, PUL-250 and PUL-275, PIF-275-19,PIF-275, PIF-300, PRF-275-19, PRF-275-17-19,PRF-3004W, PRF-304W,UL-275V,M,D, UL-275M, UL-275D, MIG00-10939, MIG00-10938, ZIG00-14658, ZIG00-14654, IF-100, RFA-48, RFA-41, PIG00-13737, PIG00-14673, PIG00-13661, PIG00-14582, PIG00-10777). Our Collar Are Also Compatible with: Extreme(Max, Active, Standard, Pro grade); Pet Guardian PG-250; Innotek SD-225; Invisible Fence (R21, R51, Micro Lite); Sport Dog(SDF-R); Patet PTS-008; Pet Stop; Dog Watch; Perimeter Technologies and so on. Size: 2mm/0.08 inch thickness，3/4 of an inch wide, up to 26 inch neck. Collar straps are pre-punched with laser precision, 2 laser cut holes 1.25" apart. It is easy to get a perfect fit with the dog’s neck by measuring and cutting to the required length. Our fashion forward collar is comfortable and stylish on your pet's neck. With easy release buckle ensures that your dog's fence training collar stays on his/her neck, keep your best pal safely contained. This replacement collar strap made of comfortable nylon material, durable soft and lightweight, it will not increase any burden on the dog's neck, a perfect universal replacement dog collar strap. Nylon replacement strap with curved locking buckle, it can be machine washed after it gets soiled.