Combi hammer series dewalt d25xxx power 1 250 watt gear 1 speed tool holder sds max weight 68 kg min idle speed 210 rpm idle speed max 415 rpm blow count max 2 840 countsmin drill diameter in concrete 45 mm special feature electronic speed control dimensions 477 x 245 x 104 cm power supply mains operation impact force 12 joule operating voltage 230 v number of gears 1