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Check the listing for details. 2pcs/set 1/4'' SDS Hex Shank Screwdriver Holder Drill Bits Adaptor Converter Kit. Condition: New. Listed at 10.15 USD. One end is SDS handle,another end is inner hexagon, the hexagonal size is the standard 1/4″, that is 6.35mm. So that it can connect all kinds of hexagonal handle tools, such as batch head, Chamfering device and drill.