Create square indents for potting-up mini blocks (older model). Designed for creating 3/4" x 3/4" x 3/4" square indentations in soil blocks for potting-up mini blocks made with the Hand-held 20 Soil Blocker (#9528). Compatible with pre-2019 Soil Blocker models (#s 9527, 9015, and 9530). Not compatible with newer Soil Blocker model #s 7860, 7861, and 7862. Includes (4) square dibbles, (4) washers, and (4) 1/2" panhead screws.