SRJQXH Black Rebar Wire Twister Hook and Wire, 26cm Long Rebar Hook Tie Wire Semi-Automatic Retractable to 36cm, Rebar Wire-Twisting Tool for Reduce Hand Fatigue and Improve Work Efficiency

Great when you've been tying wire by hand, quick to use, no need for instructions

Managed to tie approx 30 wires before springs inside unit kept sticking, there is an access nut that can be removed to lubricate spring but that only lasted another 20ish ties before the plastic gear that rotes the twister broke. Pay the extra for a more robust unit.

Broke on second wire tie. Cheap plastic internals. Not fit for purpose. Spend a little more and get one that will last.