18 Popular Square O-Ring Sizes: This Stone River Products kit includes 180 square-profile O-rings across 18 commonly used sizes for fast, reliable sealing in maintenance and repair jobs.
Buna-N 70 Durometer Performance: Made from durable nitrile (Buna-N) rubber, 70A hardness — excellent for petroleum oils, fuels, water, air, and many general-purpose industrial fluids.
Square Cross-Section for Better Static Sealing: Square rings provide increased sealing surface contact vs. standard round O-rings, helping reduce rolling/twisting and improving seal stability in many static applications.
Organized Case + Lid Chart: Rugged compartmented organizer keeps every size separated. The printed lid chart makes identification quick — ideal for shop shelves, toolboxes, or service trucks.
Great for All-Purpose Repair: Perfect for hydraulic fittings, plumbing connections, automotive and equipment maintenance, air tools, and general sealing tasks.