Ck sure drive sockets 12in drive handles and accessories ck tools t4693 the ck sure drive extension 12 drive 250mm is manufactured using heavy duty chrome vanadium steel with non slip satin chrome plated for resistance to rust and peeling featuring the sure drive system which applies torque to the flat of the nut rather than the corners to avoid rounding off ck tools t4693 sure drive 250mm extension 12 drive