Individual Tool, Rotary Scraper, Fits 2,000mL Round Bottom Flasks. Easily remove dried-on solids from the interior walls of round bottom flasks without scratching or harming your flask!• Stainless steel and PTFE for rapid sample removal• Laser etched as to size and part number• Fits Outer Joint Size 24/40 or Larger• Patent pending designChem-spin scraper tools provide an easy method of removing the majority of desired, dried-on solids from the interior walls of round bottom flasks. Motor driven, the spinning chain rapidly and effectively brushes the surface as the loose solids collect on the bottom. Minimal physical effort is required. Tedious, time-consuming, manual scraping with a spatula is eliminated.