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SDS Plus Hex Socket Adapter Square Drill Bit Extension Connector, 1/4" Hex Bit Kit Drill Bit Holder Holder Extension Connector, Electric Drill Bit Adapter - Amazon.com
Square Hole Drill Bit Holder Professional Stainless Steel for Drill Accessories | eBay
Square Hole Drill Bit Adapter, Woodworking Square Hole Drill Bits Adapter Bracket, Square Hole Drill Bit Adapter for Drill Machine Accessory - Yahoo Shopping