Use insert pins with the 2" Soil Blocker or the 20 Block or 12 Block Professional Floor Blockers (not the Mini-Blocker or the 4" Soil Blocker). Makes indentations in larger blocks to accept smaller blocks or seeds and cuttings. Cubic Pins are used for large seeds or blocks made for the Mini Blocker. 5/8" Seed Pins make an indentation for seeds. 1" Dowel Pins makes a deeper hole for cuttings. A great source of information on how to use soil blockers is the Soil Blocker Booklet by David Tresemer.