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Amazon.com: 1/4 Inch Shank Router Bit Collet Extension Chuck Converter Adapter, Convert 1/2-Inch & 1/4-Inch Shank Bits with ER20 Spring Collet, ER20 M Type Collet Chuck Wrench Spanner -(Pack of 4) :
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EDiamondTools 1-1/4 in.-7 Male to 1/2 in. Shank Adapter for Core Drilling ADJ01
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47640 1/2 Inch Shank CNC Extension Adapter for 1/4 Inch Shank Router