Adapter: SDS-MAXConnection Adapter For Use With All Max-Lok Extension And SDS-MAX Drill Bit Or Core BitUse To Extend SDS-MAX Drill Bits And Core BitsMaximum Energy Transfer Maintains Drilling ProductivityTo Convert And Extend Spline Driven Tool Use Extension Adapter MIL48206970To Convert And Extend SDS-PLUS Driven Tool Use Extension Adapter MIL48206980To Convert And Extend Bits Use Extension Adapter MIL48206980 For 12-1/2" Or MIL48206962 For 29-1/2"Comes With .35 oz. Grease