GMT-Master II ,Oyster, 40 mm, Oystersteel, Black, 126710GRNR

Model case: Oyster, 40 mm, Oystersteel
Dial: Black
Oyster architecture: Monobloc middle case, screw-down case back and winding crown. Rolex Ringlock System case architecture with Helium escape valve
Diameter: 40 mm
Material: Oystersteel
Movement: Perpetual, mechanical, self-winding, GMT function
Bracelet: Jubilee, five-piece links
Winding crown: Screw-down, Triplock triple waterproofness system
Crystal: Scratch-resistant sapphire
Water resistance: Waterproof to 100 metres / 330 feet