Spacer ring for TMI/Seiko VH31 quartz movement which enables fitting into a NH35 case. Diameter 28.9mm Height 5.6mm This is for those that wish to fit an accurate qtz movement to replace an automatic movement. Note the dimension is the minimum opening that your case would need and if being used in a case thicker than an NH35 case this item would not be usable. Item is PET acrylic. This item can be sanded down / snipped at nibs to measure for cases smaller than 5.6mm deep. Ready to dispatch immediately.