Fence Builder Calculator Jacksons The Jacksons Fence Builder is available to help you price our garden fencing panels and also our trellis panels. Simply select the style of panel . . 60mm Screws, Self Drilling Countersunk Stainless Steel are available in packs of 100 to secure panels to posts, code: 809911 for pack 100 Torx head. + 0 at £10.90 = £0.00.