Rubber construction, O-rings are one of the simplest, yet most engineered, precise, and useful seal designs ever developed, helps prevent leaks in multiple applications such as drip leaks in faucets

Sizes are specified by the inside diameter and the cross section diameter (thickness)

Assortment of the most popular 32 different size o-rings, 407 total pieces kept in a convenient re-sealable plastic case. 

• Resistant to heat, low/high temperature, air, water, petroleum products, mineral oil and hydraulic fluids, natural gases, kerosene, silicone fluids, non-aromatic fuels and solvents
• Use in plumbing, hydraulics, air, gas connections and many industrial applications
• Comes in a storage case with size marking and built-in width gauge.