Adjustable PU Cup Holder (34-39mm) for Bangle & Bracelet Outer Polishing – Lapidary & Jewelry Making Accessory

Achieve flawless finishes on curved surfaces with our Dia. 16–22mm Adjustable PU Cup Holder—a must-have lapidary and jewelry-making accessory designed for safe, stable, and vibration-free polishing of bangles, cuffs, and bracelet blanks.

Crafted from high-density polyurethane (PU), this cup holder offers the perfect balance of grip and cushioning:

• Gentle on delicate materials like jade, agate, glass, resin, metal, and ceramic—prevents scratching or marring
• Securely holds round objects with diameters from 16mm to 22mm, ideal for standard bangle cores and bracelet forms
• Fits most polishing arbors or mandrels (standard 3mm or 6mm shank compatibility—check your setup)
• Resists water, heat, and abrasion—built for long-term use in wet polishing environments

How It Works:
Mount the PU cup onto your polishing motor or flex shaft. Insert your bangle or bracelet blank into the cup—the soft interior conforms slightly to hold it in place while you polish the outer circumference with diamond pads, sanding discs, or buffs. No clamps, no slippage, no damage.

Perfect For:
🔹 Final polishing of stone or glass bangles after core drilling
🔹 Smoothing seams on metal or resin cuffs
🔹 Buffing ceramic or composite bracelet blanks
🔹 Holding small ring mandrels or tube forms during edge finishing

Pro Tip: Clean the cup regularly with mild soap and water to maintain grip and prevent abrasive buildup.

Whether you're crafting artisanal gemstone jewelry or mass-producing fashion bangles, this PU cup holder boosts precision, safety, and workflow efficiency—all in one compact tool.