3/8 minus gravel is a mix of 3/8 chip and crusher fines. This can be used as a leveling agent and base material for patios, walkways, flagstones, pavers, parking areas, and retaining walls. It can also be used in flower beds for a natural look. 3/8 minus can be used around stormwater pipes, under pavers, and subsurface drainage. When compacted tightly, it can form a hard sub-base.