Trudeau's line of professional salt mills takes grinding to the next level with the most efficient grinding mechanisms in the world. With a Rockwell hardness of 55, carbon steel provides extreme sharpness and durability to the helix shaped blades of the pepper grinder, assuring it is at optimal efficiency and ultra-resistant. The specially designed mechanism in the salt mill is made of high-quality, wear-resistant stainless steel alloy, giving you the ability to crush small or large sea salt crystals and grind salt as fine as powder. The adjustment knob features ridged grooves to enhance your grip. The salt mills come with a spring-loaded mechanism ensuring that your selected grind adjustment is consistent. All materials meet professional food industry standards.