Mandrel holds the brass center abrasive sanding discs, Moore's Discs, Yellow and Blue BC discs. The discs just snap-on and are held securely in position on the mandrel. This mandrels make changing sanding discs quick and easy. Mandrel is made of Steel, and nickle plated. SPECIFICATIONS: Capacity: Snap-On Brass Center Discs Overall Length: 1-45/64" - 43.53mm Shaft Diameter : 3/32" - 2.35mm Shaft Length: 1-5/32" - 29.45mm Material: Steel - Nickle Plated Finish