Rapid Tools RT00014 Serrated Blades with Built-in Dispenser Enviro-Pack, 25-Pack The package features a spring-loaded blade dispenser built directly into the blister of the package 100% recyclable reduces waste packaging and makes it very convenient for the consumer to use the blades directly serrated utility blade cuts more evenly, stays sharp longer and reduces friction use for drywall, nylon rope, nylon carpet and asphalt shingles