When you need a high quality fertilizer knife to get the job done, trust the name Hi-Pro mfg. We created the original B-33 Mole, the perfect knife for Strip Tiling. It's specialty treated tubes won't Rust or Corrode, and the Faceplate designed to lift and split creates the famous mole pocket, that holds ammonia better. We also offer the Mini Mole, Missouri Mole, and Hi-Pro Mole. Hi-Pro mfg. Home of the original Mole Knife.