Choose the Universal Line PSF for processing the most common materials. These robust products achieve good results with increased economic efficiency. POLIFAN flap disc for steel and stainless steel (INOX). Aggressive stock removal rate and good service life. The Bosch X-LOCK system for angle grinders enables you to change products quickly and easily. Instead of a round center hole, the X-LOCK system features an X-shaped contour, which allows the product to be fixed on the angle grinder in a form-fitting manner. This means different kinds of products can be clamped in a reliable manner in a very short space of time. The unique system meets the highest of quality and safety standards and can withstand rough and harsh application conditions.;X-LOCK from Bosch is the world's first quick-changing system for angle grinders: Position the tool in the X-LOCK holder, click it into place – and you're ready! It's never been so easy to change accessories on angle grinders. X-LOCK is creating a new standard which makes professionals’ lives easier and increases their productivity. Bosch Power Tools relies on strong partners like PFERD. PFERD has developed the principle for connecting the X-LOCK punched part with the bonded abrasive, flap discs and brushes and created the conditions to enable them to be produced industrially.