supply of rotary hammerrotary hammer,5 drill bits rotary hammer drill ndrf with following minimum specifications power supply - 2 30 v, 50 hz, single phase, power rating 700-watts rotation speed of the hammer 1200 rpm. number of dri ll bits require minimum 5 nos. length of drill bits (in cm) minimum 30 cm chisel adjustment with mode sele ctor switch for drilling/ chiselling shock proof machine body protective carry case warranty minimum 1 year . make- bosch model gbh228dv. black & decker dewalt ralli wolf kpt stanley or any similar branded & qu ality make [ warranty period: 12 months after the date of delivery ] ]