Lenox Hole Saw, 1/2 in Arbor, 1-7/8 in Cutting Depth, 4/5, 3/8 in Shank, Hex Shank, Tooth Type: Advanced, 1/4 in Dia x 3-1/4 in L Pilot Drill, 25 mm Diameter, Bi-Metal Cutting Edge, Alloy Steel Body, Full Polished/Nickel Chrome, Applicable Materials: Aluminum, Cast Iron, Metal, Mild Steel, Stainless Steel, Wood, Suitable for: 5L Snap-Back, 1L, 4L or 5L Standard Arbor50% longer life, 2X more durableImproved metal cutting performance – increased wall thickness improves durability and minimizes tooth lossOptimized tooth design – penetrates metal with easeFast, efficient cutting in woodLarger, sharper teeth – remove more wood for fast cuttingEasy plug removalSpeed slot staircase design – for fast, easy plug ejection