15" Medium Duty scrub brush for the 15" Prolux Core floor buffer. This high quality scrub brush is just what you need for more durable hard surfaces that could use some extra scrubbing power! 15 Inch Medium Duty scrub brush for Prolux 15 inch Core floor buffer. This high quality scrub brush is just what you need for more durable hard surfaces that could use some extra scrubbing power. WORKS WITH THE 15" CORE MODEL ONLY