The Milwaukee 12-Piece Hole Dozer Bi-Metal Hole Saw Kit includes the Quik-Lok Arbor System delivering the fastest hole saw changes and universal fit in a Packout Storage Organizer. The Quik-Lok Arbor System includes pre-assembled adapters on all hole saw sizes, which eliminates the need for multiple arbors and saves you time with the fastest hole saw changes. The threaded adapter design allows for hole enlargement capability with our large thread pin adapters. Our all-access slots paired with the Quik-Lok Arbor System offer the best solution to frustrating plug removal, making you more productive with less downtime between holes. Our proprietary slot design also gives you increased pilot bit visibility for accurate placement and faster chip ejection, keeping your hole saw cutting cooler longer. The Milwaukee Hole Dozer Bi-Metal Hole Saws feature a tooth design that offers you the longest life backed by the industry's only Lifetime Tooth Break Warranty and can take on all general-purpose applications, including metal, aluminum, drywall, wood, and wood with/nails.