DIAMOND CORE DRILL BIT ADAPTER 5/8"-11 Thread Male To Sds Plus Shank. This Is Basically An Sds Plus Diamond Core Bit Arbor, It Holds Diamond Core Bits And Allows Them To Be Used With Sds Plus Drill. These adapters will Not Fit Regular Hole Saws - They are Specifically for Core Bits or Accessories with 5/8-11 UNC Thread like the thread on a 5/8 bore Angle Grinder CORE ADAPTER EXTENSION Adds Extra Length To Diamond Core Drilling Bits, Diamond Core Drill Extension Is 9 3/4" Long (238mm) DIAMOND CORE BIT ADAPTER Extension Is a Heat Treated Core Bit adapter Extension it is Heavy Duty and comes with a wedge to remove TCT Pilot Drills - Available Separately SDS Plus Core Adapter Extension is Also Available in 4 1/2" Length Version. SDS CORE BIT ADAPTER EXTENSION Is Also Available In 5/8"-11 Male To 7/16 Hex 9 3/8" Long Sds Plus Core Bit Adapter / Arbor Screws Into the 5/8-11 Female Threaded End Of Diamond Core Drill Bits And Not Only Holds The Diamond Cores But Also Extends The Depth Of Cut. this Sds Core Drill Bit Adapter Extension Comes With A Drift Key For Removing Tapered Masonry Tungsten Carbide Tipped Pilot Drills (not Included) from the sds core drill adapter The Pilot Drills Are Used To Start The Core Bits Off And then Removed from the sds core adapter Once The Diamond Core Bits Create A Groove that can hold themselves in place. SDS Plus Core Drill Adapter is Heat Treated for Heavy Duty Use.