SPUR® Heavy Duty Steel-Lok wall mounted shelving uprights are made with 2mm thick steel and have been made at up to 3.6m in length however costs increase dramatically over 2.4m due to production constraints. To calculate the sizes that we can manufacture take a standard size and add multiples of 1 1/4" 31.75mm which is the original and standard pitch for the Spur Steel-Lok system.