Crosshatch angle is important, but not as critical to creating a perfect bore as roundness, straightness and surface finish. Typical crosshatch angles are 45 or 30 degrees, +/-5 degrees. Lighter tension rings will usually use the 30 degree crosshatch angle. A steep crosshatch provides a faster relief of oil, while lesser angle holds more oil. Another aspect is ring rotation, which is driven by steeper angles, so the lower angles are more appropriate with low-tension, thinner, rings.