Combi hammer series dewalt d25xxx power 1 100 watt gear 1 speed tool holder sds max weight 61 kg idle speed max 400 rpm blow count max 2 470 countsmin drill diameter in concrete 40 mm special feature dust cover dimensions 457 x 245 x 104 cm power supply mains operation impact force 8 joule operating voltage 110 v number of gears 1