ZKM Black Pet Puppy Dog Rivet Spiked Studded Neck Strap Buckle Collar Adjustable S Color: Black Dimension: 1.5 x 37 cm,0.59" x 14.7" Fit neck size: 24cm/9.4"-31cm/12.2" Min. diameter: about 8.5cm / 3.35" Max. diameter: about 11cm / 4.3"