Hollow Blocks $0.78

Description

Hollow blocks are used in construction projects to build fences and walls. They typically have holes that make up 25% to 50% of their cross-sectional area. The holes make the blocks significantly lighter, but still give them strength where they need it. The holes in the blocks allow electrical wiring and piping to be run through them, and rebar can also be placed in the holes to give the blocks even more strength.