These 4 inserts are meant to be snapped into a Mini 4 Blocker, to make cube-shaped pockets in your 2" soil blocks, so that they can receive ¾" micro-blocks made by the Micro 20 Blocker.
Makes five 1½" soil blocks in one stroke. Using soil blocks allows for easy transplanting and eliminates root spiraling. Made in England by Ladbrooke Ltd.