CMT 551-025X Bi-Metal Plus Hole Saw 1" (25mm) Solid Carbide Knives What size column is this

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CMT 551-025X Bi-Metal Plus Hole Saw 1" (25mm) Solid Carbide Knives What size column is thisThe CMT 551 025X is a 1" (25mm) Bi Metal Plus Hole Saw (Series 551X) with XTREME FAST Push&Lock system. The 8% Cobalt bi metal construction provides 2X longer cutting life than standard hole saws, and cuts stainless steel, steel, cast iron, aluminum, copper brass, and plastics. SPECIFICATIONS Diameter 1" (25mm) Blade Material Bi Metal (BIM) 8% Cobalt Tooth Pitch Variable 4 6 TPI (alternate and side set) System XTREME FAST Push&Lock Arbor Compatibility