Hole Saws Primary Material Application Drywall Metal Plastic Wood Arbor Design Not Included Tooth Material Bi-Metal Saw Dia 4 1/4 in Teeth per Inch 5 Number of Teeth (Hole Cutters Only) 5 Teeth Per Inch Max Cutting Depth 1 3/4 in Replacement Arbor Mfr No HBT425 Thread Size Not Applicable Shank Size 1/4 in Pilot Drill Size 4 1/4 in Dia x 1 1/8 in L