I bought these to use when laying the floor. I read some reviews before buying and had them say the block will break or wasn't strong enough, or I think strong enough to withstand hammer blows so it could push firmly into the ground, then I saw it. I read the description and it says the block is solid to the bone. Haven't used them yet but if they hold up I'll let you know, if they hold up I'll just let you know, keep calm.