The second is using tip-ups, which are made of wood or plastic, and have a spool of line attached, with a thin piece of metal that goes from the spool to the flag. Black line is put on the spool and a swivel is placed at the end of the black line. Then a piece of fishing line with a hook is attached to the swivel. Worms, power bait, grub worms or small minnows are placed on the hook. The hook with bait is placed into the water under the ice. The depth that the bait is placed goes according to several theories. One theory is the bait is placed one meter under the ice. The second is that the bait is placed two to three metres under the ice. The third is that the bait is suspended one foot (30 cm) above the bottom of the lake. When the fish strikes the bait the flag is lifted which notifies the angler that he has a fish on the hook. The angler pulls the line in and the fish fights. The angler will allow the line to slip through his hands during the struggle. Finally, when the angler can get the fish's head into the hole in the ice, the fish is quickly lifted onto the ice. This allows for less-intensive fishing.