Victor Multi-Kill Brand Blocks II (model M2030) is an economical, yet powerful single-feed, second-generation anticoagulant that kills Norway rats, roof rats and house mice in three to five days. Its active ingredient, difenacoum, may be new to the US market — but it’s been a primary rodenticide active for European pest professionals for years thanks to its reliable performance and toxicity profile. Vitamin K1 is the antidote. Registered and approved for use in all 50 states, the product is available in 18-lb. buckets of highly palatable 1-oz. blocks, and may be used in and within 100 ft. of a manmade structure.