The thickness can vary from brand or manufacturer. Further, this aspect ensures that your movement is more stable and your vehicle gets ideal protection against particles. The ideal thickness must not be more than 0.12 inches. Rock sliders must offer maximum protection against dust, dirt, and other particles. So, if your product is not offering this you do not have perfect sliders. Thick rock sliders are a must for rough use. They are ideal for your truck in every way to shield it against all damages.