Product Description: • Size: 5/16'' * 24 Threads • Max Operation Speed: 12000RPM • Density: Medium, Soft Special highlight: • Holder enables the use of (PSA)self-stick Sanding Disc (sold separately)) on a disc sander, rotary sander, or random orbital sander • Low profile firm density foam is well-suited for flat sanding applications • Tapered edge provides some flexibility for feather-edging Features: • 5 inch in size, allowed max 12000RPM operation speed. • Dual-action random orbital. • Hairy surface sanding pad friction is greater, more suitable for grinding more rough surface. • Suitable for 125mm power sanders and polishers. Function: • Apply to surf board, ambry, marble mesa, stainless steel plate or various kinds of wide materials polishing burnish