,Bi-Metal,Shank 1/4.5 in, Teeth per Inch 5, Number of Teeth (Hole Cutters Only) 5 Teeth Per Inch, Max. Hole Saws,5" dia. Hole Saws, Primary Material Application Drywall; Metal; Plastic; Wood, Arbor Design Not Included, Tooth Material Bi-Metal, Saw Dia.