Pferd 24562 Spherical Carbide Bur SD-3 Pferd Sale! from 1764 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Shank Diameter: 1/4" Head Diameter 3/8" Head Length 5/16" Cut: Double Shank Length: 1-3/4" Overall Length: 2-1/16" SKU:PFE 24562