PFERD POLINOX PNER unitized disc is used for end grinding on angle grinders. The unitized fleece is bonded to a glass woven base. The PNER discs are recommended for working larger areas on stainless steel (INOX) components. POLINOX PNER unitized discs achieve their best performance on variable-speed angle grinders at a cutting speed of about 6,900 SFPM. Ergonomically optimized products and power tools that contribute to greater safety and working comfort, and thus to health protection. Comfortable working with reduced vibration . Specification: Diameter x width (inches): 5 x 1/2; Arbor Hole: 7/8; Abrasive: Silicon Carbide; Grit: Fine; Grade: MW; Density: Medium-Soft; Spec.: 3SF; Recom. RPM: 5400; Max. RPM: 10000.