PFERD POLINOX PNER unitized wheels have been designed for variable-speed angle grinders and fillet weld grinders. It is recommended for working fillet welds and slots that are difficult to access or indentations in stainless steel (INOX) components. POLINOX® unitized wheels achieve their best performance on special electronic fillet weld grinders. PNER non-woven tools consist of multiple layer, strongly compressed non-woven material, bonded in a special grit resin system. This bonding system produces non-woven tools with excellent surface finishes, high stock removal and long tool life. Provide medium flexibility when working on soft metals, alloys, high-alloy steels and titanium alloys. 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 1/4; Arbor Hole: 7/8; Abrasive: Aluminum Oxide; Grit: Coarse; Grade: H; Density: Hard; Spec.: 8AC; Recom. RPM: 4500; Max. RPM: 6100.