New Watch Case Opener fits Rolex Oyster. This is a new watch case opener & closer. It is designed especially for all Rolex water resistant screwback oyster cases. It accurately interlocks with the knurled edges of genuine Rolex case backs. It will not slip or damage case backs. This sturdy frame fits any bench vise. This adjustable case holder accommodates all case sizes.You receive:One die measuring 18.5 mm in diameter. One die measuring 20.5 mm in diameter. One die measuring 22.5 mm in diameter. One die measuring 26.5 mm in diameter. One die measuring 28.5 mm in diameter. One die measuring 29.5 mm in diameter.