"the SDS fitting is quite soft metal. I used as recommended with a core drill having a clutch, and was drilling 152mm dia for a fan through brick / block wall. It snatched and twisted the SDS grouve into a spiral, I had to use a vice and hammer to remove. Screwfix replaced, Even without incident , the replacement is showing marks in the metal from the drill chuck.
Summary - may be OK for smaller cores, avoid if using larger diammeter, or tough material which may produce high torque."
"bought this arbor along with core drill ,drill guide and ejector drift , managed to drill through soft block ok but half inch into brick, arbor sheared . i then spent 3 hours trying to remove piece that was left in drill chuck.so not pleased."
"I drilled one 100mm hole with this shank fitted into a SDS drill with a clutch. The core drill never jammed or was pushed with any force. When I looked at the shank after use it was twisted and distorted."