Key for opening and closing waterproof and grooved watch case.Comes with 6 grooved chucks that are perfect for opening oyster-shaped Rolex and Tudor watch case backs: Ø 18.5mm-20.2mm-22.5mm-26.5mm-28.3mm-29.5mm.
Alumimun handle, solid stainless steel dies. The quality of this item is better than 103-150.