Wotefusi New Watchmaker Watch Back Case Opener Closer Instrument Set + Holder/Grooved Dies/Adapter Package including:One professional watch case opener (NO. 5700) One grooved dies and adapter (NO. 5538) One case holder (NO. 5674) ;Note: 2 Kinds of Cases Open Tool are sent randomly. Four pairs of reversible case holding jaws with lug width from 9mm to 22mm/Five pairs of chucks for cases with different styles One hex wrench/Four mounting screws