1) Lead screw is rolled forming from extra-duty feature steel
2) Gears are made of high grade forging steel
3) Dimensions of connection meet the TTMA and AAR specification
4) Lead screw nut applies floating construction, easier for lifting and longer
persistence for use
5) Static load, lift test and drop test according to ABS specification
6) Double adjustable transfer real power in low gear
7) Spline slight, easy operation
8) High quality best price, market feedback well