Weiler 1-1/8" Nickel-Plated Cup End Brush 1-1/8" .014" Stainless Steel Knot Wire Fill, Max RPM 22,000. APPLICATION: Ideal for more demanding light-duty cleaning applications in corners and hard-to-reach areas. 1/4" stem diameter for use on die grinder and right angle die grinders. LONG BRUSH LIFE: Manufactured with the highest quality construction for smooth, efficient performance and long life. HEAVY-DUTY BRUSHING: Hollow end and heavy duty brushing action with some flexibility. End brushes feature an integral 1/4" steel stem for safe operation at high speed and quick mounting into the collet or chuck of either electric or pneumatic die grinders. End brushes are available in a variety of knot wire and crimped wire configurations for use in a broad range of applications, and they are manufactured with the highest quality construction for smooth, efficient performance and long life. Weiler's end brushes are available in heat-treated steel, Type 302 stainless steel, and bronze or brass wire. Made in USA