CMT 301.000.02 Boring Bit Adapter Shank=M8 LH BC Post Cap Why does this post base

Why does this post base include a 1-inch standoff

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CMT 301.000.02 Boring Bit Adapter Shank=M8 LH BC Post Cap Why does this post baseThe CMT 301. 000 is a boring bit adapter with M8 threaded shank for attaching dowel drill bits to boring machine spindles. Right hand rotation. SPECIFICATIONS Shank Thread M8 Shank Type Threaded Rotation Right hand (RH) Country of Origin Made in Italy COMPATIBLE MACHINES CNC Boring Machine Multi Spindle Boring Machine Panel Processing Center KEY FEATURES Threaded M8 Shank Secures dowel drill bits to multi spindle boring machine spindles. Compatible