Thanks to my knowledge gained in practice I can say that this grommet assortment is a perfect fit .The plastic material provides durability and protection against electrical damage. The ASSORTMENT has a good variety of sizes which is helpful for any project. The only con is that the packaging needs more organization to make it easier to find the correct size. Overall, this grommet assortment exceeded my expectations and I highly recommend it for any electrician looking for a quality product..