The Big Cheese Ultra Power Block Bait Rat Killer Kit - STV566 is guaranteed to kill rats fast. This trap is safe for use around children and pets, has a secure lockable lid so there is no escape for your captured rodents, and the rodents are hidden from sight. It can used both indoors and outdoors. Fast acting bait which kills mice in one feed. Use indoors and around buildings. It comes supplied with 3 x 20g brodifacoum blocks.