Cully™ Variable Pitch Hole Saw, Variable Pitch, 6 in Dia, 1-1/2 in Cutting Depth, 5 TPI, 5/8-18 Arbor, Bi-Metal Cutting Edge, Bi-Metal Body, Serrated Cutting Edge, Use Arbor: M45P, M55P and M44K, Applicable Materials: Wood, Plastic, Machinable Metal, Tin, Aluminum, Stainless Steel and Nail Embedded Wood