Also used in hockey to indicate a certain lack of touch with the puck. If you couldn't hit an open net with a beachball, you've got hands of stone.
The antonym would be either great hands or soft hands. Now, I've been watching and listening to hockey broadcasts since I was knee high to a grasshopper, and still when I hear a hockey announcer say of a big burly player: "He's got such nice, soft hands" it catches me off guard.
Jaromir Jagr has soft hands. Enforcers like Dave "The Hammer" Schultz usually have hands of stone.