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- Use our concrete calculator to estimate your bag count
- Set mailbox posts, fencing, and lamp posts; no mixing required
- 4000 psi concrete in 28 days
Quikrete 50 lb. Fast-Setting Concrete Mix is a special blend of fast-setting cements, sand and gravel. Designed to set hard in 20-40 minutes. Concrete sets posts without mixing. Easy to use by simply adding water.