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Flexible Shaft Extension Bits,SDS Plus Shank to 1/4" Hex Socket Adaptor and 1/4"3/8"1/2" Square Drill Bit Extension Connector - Amazon.com
MILWAUKEE, SDS Max Drill Bit Shank, SDS Max Tool Side Shank, Max-Lok Extension - 45L208|48-20-6962 - Grainger
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