K3 Master System, Interchangeable Drill Guide Block between the benchtop and portable bases. Benchtop base features patent pending front clamping design. 1/8” incremental settings for materials from 1/2” to 1-1/2” thick. Patented three drill guide fixed spacing on the Drill Guide Block. Dust Collection Shroud, say goodbye to woodchips. Material support stop lets you consistently repeat hole spacings. Kreg Tool