Easy to use. Moisten soil mix such as Johnny's 512, push block maker down, turn, squeeze, and lift. Set filled block maker into a tray and release. Makes one huge 4" block with a 2" square dibble to receive medium size soil blocks. Great for larger plants like tomatoes, peppers, eggplant, melons, and cucumbers, and for late transplanting. Developed in conjunction with Eliot Coleman.