O-Ring Watch Case Gasket Assortment Medium And Extra Large Sizes 180 Pieces

This o-ring watch case back seal assortment is a great gasket kit for watchmakers and others who work on watch case backs. These round gaskets are made of solid tube rubber to create an airtight seal and are flexible enough to fit not only round watch case backs but, square, rectangle and other fancy shaped case backs. The thicknesses range from .40mm to 1.0mm and the inside diameters range from 27.0mm to 46.0mm.

Note: Diameter measured is the interior diameter of the gasket

• Assortment contains 60 different o-ring sizes in 7 different thicknesses
• In .40mm thickness there are 6 different sizes: 27.0, 28.0, 29.0, 32.0, 36.0 and 39.0mm
• In .50mm thickness there are 9 different sizes: 25.0, 27.0, 29.0, 30.0, 32.0, 34.0, 35.0, 36.5 and 40.0mm 
• In .60mm thickness there are 11 different sizes: 25.0, 28.0, 29.5, 30.0, 31.0, 32.0, 34.0, 38.0, 39.0, 40.5 and 45.0mm 
• In .70mm thickness there are 9 different sizes: 24.0, 28.0, 29.0, 34.0, 35.0, 36.0, 38.0, 39.0 and 40.0mm
• In .80mm thickness there are 10 different sizes: 25.0, 27.0, 32.0, 34.5, 35.0, 36.0, 39.0, 40.0, 42.0 and 45.0mm
• In .90mm thickness there are 6 different sizes: 29.0, 30.0, 34.0, 35.0, 37.0 and 39.0mm
• In 1.0mm thickness there are 9 different sizes: 26.0, 28.0, 31.0, 33.75, 36.0, 38.0, 40.0, 42.0 and 46.0mm
• Contains 3 of each size
• Can easily be reordered by size in the following format: thickness-mm diameter (40-2700)
• Refills are available in packages of 3
• Kit has a total of 180 pieces
• O-rings fit a variety of watch case backs from round to square
• Helps to maintain an airtight seal
• Medium and extra large size o-rings
• Made of nitrile rubber