Mold divider 30"x30" (Includes 1x BB-M6 = 8x bolt M6. Dividers can be used to make several smaller blocks with a standard concrete block mold (except for the -T and -W shapes). By placing one or more dividers between the studs in the mold, you can create multiple blocks at once. Half blocks are necessary at the end of a straight wall but can serve many more purposes,)