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The gauge is the thickness of the stainless steel. An easy rule of thumb is, the lower the number of the gauge, the thicker and better the stainless steel. Therefore, 18 gauge is better than 20 gauge. Most under mount sinks are 18 gauge(16 gauge is available), with the top mount sinks.

The 18g is widely considered a good thickness for use in a kitchen sink. You should have no bending or dinging over time from an 18g sink. Twenty gauge sinks are usually not used as they are generally regarded as very thin. The best choice would be to go with a 16g sink. A 16g sink is going to be the most durable option, and will most likely outlast your kitchen.

16 gauge stainless steel is thicker. So, it is less susceptible to denting when something knocks into it, like a heavy pan. It also provides more sound deadening.

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