www.randrmagonline.com/articles/83544-blades-designed-for-safety-efficiency
Blades designed for safety, efficiency
November 28, 2011

“If you or anyone you know have ever cut into anything behind drywall or plaster board, then here is a product to prevent future disasters,” the company said. Saf-T-Kut drywall blades are designed for and fit most commercial reciprocating saws.
The small orange blades have a serrated edge rather than teeth which cuts down drywall dust dramatically, making straight, fast, and safe drywall cuts. Two blades per pack, with an average lifespan of approximately 300-500 linear feet.