Our big Brutus spiked dog collar has 1/2 inch tall solid steel nickel-plated spikes. These heavy duty 2-ply collars are made with heavy nickel hardware. This wide spike dog collar is available in colors Black or Burgundy and in sizes 21, 23, 25, 27 and 29. We are proud to say that this is MADE IN AMERICA! For correct collar size measure your dogs neck. Size 21 will fit a dog with a 15-1/2 to 18 inch neck. Size 23 will fit a dog with a 17-1/2 to 20 inch neck. Size 25 will fit a dog with a 19 to 22 inch neck. Size 27 will fit a dog with a 21 to 24 inch neck. Size 29 will fit a dog with a 23 to 26 inch neck.