Dogs My Love Real Leather Black Spiked Dog Collar Spikes, 1.25" Wide. Fits 15.5"-20" Neck, Medium Breeds Strong and durable genuine leather. Light, elegant and not stiff Nickel-plated hardware and heavy duty D-ring. Trimmed with thick contrast color waxed thread. Overall length 22", will fit 15.5"-20" neck 1.25" wide 3/16" thick genuine leather 4 metal enforced adjustment holes