38mm carbon fiber case, 4130 movemen, sapphire crystal

Description: Need the professional tool to open the case back,pls. order the screw together if need. Case Material: Carbon fiber Case diameter: 38.0 mm Case height : 46.5 mm Thickness : 13.0mm Lug width: 20.0mm Dial diameter:29.0- 29.5 mm Glass : sapphire glass Fit movement: 4130 Water resistance : 30mm