Qualitas American Standard Q195 material.Perfecta qualitas (cuspis clavus, clavus rotundus, corpus rectum clavus, solidum glutino, etiam clavus ordo) clavus clavus lucidus et planus, plus sclopetis salutaris, alta vis, alta efficacia, omni clavus bonus, patella, calidum patella (rubigo. -proof and beautiful) Diameter:2.1mm to 3.8mm Lenght:25mm to 90mm