Haha! Sorry, Jim. Why I'm up at 3 AM looking at neatorama anyway is anyone's guess. Your answer is clearer than mine, though! Abusive comment hidden. (Show it anyway.)
Joints... that's what I meant. Not cracks... I think joints is the word I meant. I THINK. Abusive comment hidden. (Show it anyway.)
It appears to be a tool for creating "cracks" in sidewalks... you know, those "cracks" every few feet or so that make the sidewalk look like it's separate pieces joined together. I know I described this in a crummy way, sorry! Abusive comment hidden. (Show it anyway.)