Product characteristics:
    1) This product is our technical innovation. Our patent number is: 200621027669.8; at present, only our company could make this kind of extension ladders;
    2) This product uses light epoxy resin manufacture, suitable for repairs in local, transformer substation overhaul, fire protection, meter reading, etc. May lay in the ordinary cars, facile and durable.
    3) The product weight 2.75 kilogram/meter, lower than the original decadent square tube products, which is 4 kilogram/meter. Solved the original product unwieldy to carry and inconvient malpractice.
    4) The product each meter could withstand 200 kilograms impulse, elongating to 2 meter, 2.8 meter, 3.2 meter, 3.8 meter, 4.0 meter. 
    5) The product could bear 220k Voltage.

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