supply of insulated rail dolly with attachmentinsulated rail dolly with attachment,insulated rail dolly with attachment for carrying concrete sleeper and rails f or bg (technical specification 1.tubular frame : made of mild steel heavy duty pipe of normal bore 40 mm 25 mm as per required tolerances . 2. chain : made of alloy steal. 3. hook bolt : made of high carbon st eel 4. gusset plate : made of ms flat or ms plate 5. wheel assembly : far track circuited area : assembly sh all consists of two double flanged wheels with cast steel duly insulated the hubs to accommodate the shaft and bearing.) [ warranty period: 30 months after the date of delivery ] ]