Our Carbide Chain Knocker for the M18 FUEL™ High Speed Chain Snake delivers a wall-to-wall clean that can tackle scale build-up, hard deposits, grease, and tough blockages. The carbide chain knockers are best used in Cast Iron and other hard-walled pipes. These carbide tabs deliver strength and durability for long-lasting descaling performance. These steel chain knockers feature durable construction to tackle tough clogs in 1-1/2” lines. Featuring stainless steel set screws for corrosion resistance. Additional accessories available for more descaling and breaking up grease: 2” Carbide (48-53-3025), 3” Carbide (48-53-3026), 4” Carbide (48-53-3027), Grease Penetrating Head (48-53-3028).