Bonart 30K IF-100 FS Slim Series #100 Ultrasonic Insert with White Plastic Grip. Internal Water Flow, Slimmer tip for better perio scaling, made with American made stainless steel tips, and nickel strip stack. Compatible with most major brand magnetostrictive scalers. Bonart IF100 Series Universal Internal Flow Platiic Handle Ultrasonic Insert is designed and quality crafted by Bonart's experts of engineers. Built to perform to the high level of scaling performance standards established by the major brands. Insert is available in both the 25khz SKU: TM0004-452 and the 30khz SKU: TM0004-462