The Professional Hedge Shears from Bahco of Sweden (P51H-SL) have 730mm handles and cutting capacity of 10 mm.
These superb garden shears combine stamped, fully-hardened steel blades with aluminum round tube handles for durability and reduced weight.
Rubber buffers reduce strain and fatigue during use.
If you are regularly cutting large amounts of hedge, then you'll want to invest in a pair of these 'top of class' professional hedge shears to produce the best results with the minimum of muscle fatigue.