 More precise manufacturing tolerances within the cylinder make bumping easier because the mechanical tolerances of the lock are smaller, which means there is less loss of force in other directions and mostly pins move more freely and smoothly.Locks made of hardened steel are more vulnerable because they are less prone to damage during the bumping process that might cause a cheaper lock to jam.In the United Kingdom, a British standard TS007 Kitemark has been legislated which benchmarks the effectiveness of bumping at 1-star level and 3-star level.