Milwaukee® Recessed Lighting Hole Saw, Continuous Grit Edge, Series: 49-56, 4-3/8 in Diameter, 1 in Cutting Depth, 4 TPI, 5/8-18 Arbor, 1.57 in Overall Length, 1/4 in Dia x 4 in L Drill, Carbide Cutting Edge, HSS Body, 600 rpm Speed, 1/2 in Chuck, Hex Shank, 7/16 in Shank, Use Arbor: 49-56-9100 Quick-Change Arbor, Black, Applicable Materials: Acoustical Tile, Drywall, Plaster, Stucco with Mesh and Wood