Stainless Steel Propeller Paddle With One Line Blade For Benchmark 20L and 40L Overhead Stirrers, 1/EA. This optional propeller by Benchmark Scientific is designed for laboratory use. Crafted from stainless steel, this propeller is durable and resistant to corrosion, ensuring longevity. The one-line design enhances mixing efficiency, making it ideal for various laboratory applications. Compatible with select models, this propeller is easy to attach and use. Upgrade your equipment with this reliable Benchmark Scientific stainless steel propeller for improved performance and results in your lab experiments.