I Wonder What Are They Shaped Like

A man is walking down the street in New York City when he comes across a shop with clocks and watches hanging in the front window.
”Good!” he thinks to himself. ”I can get my watch fixed.”
He walks into into the shop and says to the man behind the counter, ”My watch stopped a couple days ago. I’d like you to fix it.”
The shopkeeper replies incredulously, ”I don’t repair watches, I’m a mohel!”
”Then why do you have all those watches and clocks hanging in your window?”
The mohel replies, ”What would you suggest I hang there?”