Hole Saws, Hole Saw, Primary Saw Application Metal, Saw Dia. 7/8 In., Max. Cutting Depth 1-15/16 In., Arbor Design Not Included, Tooth Material Bi-Metal, Teeth per Inch 5/6, Tooth Material Grade M42, Thread Size 1/2 In.-20, Replacement Arbor No. Mfr. No. MA24, MA34, Pilot Drill Size 1/4 In. dia. x 3-3/32 In. L