The Milwaukee Grease Penetrating Chain Snake Head for the M18 FUEL™ HIGH SPEED CHAIN SNAKE KIT w ONE KEY delivers the ability to open fully blocked up grease blockages. Combining the penetrating head with a chain knocker will deliver the best results in opening and delivering a wall-to-wall clean. The steel penetrating head features durable construction to tackle tough clogs in 1-1/2" – 4" lines.