Sealey 5 piece wobble extension bar set 1 4 sq drive sealey premier ak766 forged chrome vanadium steel shafts heat treated and chrome plated with mirror finish cut away tips allow sockets to be driven with shaft offset of 10 deep knurling on shafts allows extra grip for oily fingers when spinning off sockets sprung ball socket retainers sealey ak766 wobble extension bar set 5pc 1 4 sq drive