The 40.280 Universal Drill Guide is Zipbolt’s most versatile installation accessory for installing Zipbolt products Simplifies the process of installing your Zipbolt hardware by ensuring consistency when drilling holes Drill guide has hardened steel inserts for increased durability, holes are lettered for easy reference when drilling Drill bits consist of High Speed Steel, 25mm forstner bit is tipped with tungsten carbide Compatible with Zipbolt 11.560, 11.600, 12.700, 12.720, 13.500, 13.520, 13.610, 13.810, and 13.960