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Gravel

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7 Stone

#7 stone is crushed rock screened between about 1/2 inch and 3/16 inch, with the fine dust washed out. The pieces are angular, so they wedge together under weight instead of rolling around. Most #7 you'll see is limestone, granite, or trap rock, depending on what's quarried near you.

The 7 is a size code from the ASTM D448 spec. It tells you how big the pieces are and says nothing about what kind of rock they came from. You'll usually pay a bit more than a coarser stone like #57 because #7 takes more screening to hit that tight size range. Most yards sell it washed, since it's the go-to for ready-mix concrete and pipe bedding.

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named grade in this family

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we can put on a truck

What people use it for

Coarse aggregate in ready-mix concreteAsphalt hot mixPipe bedding and backfill around drain linesFrench drains and yard drainageLeveling course under paversDriveway topping over a coarser base

How to choose within 7 stone

Foot traffic

Pea gravel and river rock feel good barefoot but shift underfoot; use a border so they stay where you put them.

Vehicle traffic

Round gravel rolls under tires. Pick angular crushed stone for a driveway; save rounded gravel for garden paths and beds.

Drainage

All of these drain well. Bigger pieces drain faster; smaller pieces pack tighter.

All 7 stone grades

#7 Stone (#4 To 1/2″)

Driveway baseDrainage systemsErosion control

Other gravel families

Rip Rap

Rip rap is large, angular rock you place on a slope to keep water from washing the ground out.

Pea Gravel

Pea gravel is small, round rock about the size of a garden pea.

Gravel 2 Stone

#2 stone is crushed rock in pieces about 1.5 to 2.5 inches across.

Gravel 3 Stone

#3 stone is crushed rock screened between about 2 inches and 1 inch.

Gravel 1 Stone

#1 stone is chunky crushed rock, with pieces running about 1-1/2 to 3-1/2 inches across.

Gravel 9 Stone

#9 stone is crushed rock screened between about 3/8 inch and 1/16 inch.

Gravel Sand Blend

A gravel sand blend is a mix of small stones and sand in one pile.

Sand Gravel

Sand and gravel is a natural mix of small rock and sand pulled straight from a pit or riverbed.

Gravel 4 Stone

#4 stone is big crushed rock, with pieces running about 1 1/2 inches to 2 1/2 inches across.

Gravel 57 Stone

#57 stone is crushed rock screened between about 1 inch and 1/4 inch, with the fines washed out.

Gravel 6 Stone

#6 stone is crushed rock screened between about 1 inch and 3/8 inch, with the fines washed or screened out.

Gravel 8 Stone

#8 stone is crushed rock that's been screened to a small size, roughly 3/8 inch down to about 1/8 inch.

Browse all gravel families →