Fence posts to put in? This thing takes some beating, and it's cheapest at Argos at the moment, with free delivery (including next day if ordered before 3pm).
Tubular steel rammer for driving wooden posts deep into the ground. Can be used on either square or round posts. 670mm long, 350mm dia including handles with 170mm dia tube.
Some excellent reviews here, and on Amazon - a typical review:
"The quality size weight and paint finish of this product was excellent value for money; I would highly recommend this product to anyone single handily erecting perimeter fences using large round or square wooden fence posts."