Brass cup-style rotary brushes for surface cleaning on delicate and precision materials — the larger-diameter companion to the Proxxon flat brass brushes. The cup profile delivers broader surface contact than a flat wheel brush, making it ideal for cleaning larger flat areas, deburring edges, and surface preparation in a single pass. Brass bristles are acid resistant and electrically neutral — safe for electronic components, precious metals, and non-ferrous surfaces. Specifications: Brush diameter: 33/64" (approx. 13mm) Style: cup brush Shank diameter: 2.35mm (3/32") — fits standard Micromot collets Bristle material: brass (acid resistant, electrically neutral) Quantity: 2 brushes per pack Ideal for surface cleaning on: Brass and brass alloys Copper Precious and semi-precious metals Stainless steel Semi-precious stones Plastics and wood Electronic components (acid resistant & electrically neutral) Proxxon No. 28963 Works Well With: Professional Rotary Tool IBS/E — primary compatible Micromot rotary tool Proxxon AC Adapter NG 5/E with Electronic Speed Control (No. 38704) — variable speed bench power for controlled brushing Proxxon AC Adapter NG 2/S (No. 38706) — basic bench power supply for Micromot tools Brass Brushes 5/16", 2-Pack (No. 28961) — smaller flat wheel brush for detail and tight-access cleaning Tool Holder for Rotary Tools — mount your rotary tool hands-free for stationary brushing work Returns can only be accepted for unused product in its original packaging. In addition to the returned item/items, a copy of the original packing slip or invoice is required. If proper paperwork is missing, PROXXON Inc. will not issue a credit. For warranty claims please call 1-877-776-9966. Please see our return and refund policy here. California Residents Prop 65 Information WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
