Features: STRONG 1 5mm "internatonal standard" column steel plates made in Shanghai 2 8mm brace arm and 6mm internal sliding column, never deform 3 Wearable, Anti-High temperature, high strength oiliness macromolecule nylon slide block 4 Require no less than 150mm cement on the ground, at least C25 SAFETY 5 Double safe antiskid device, from column ladder safe to close protection by dydraulic pressure, ensure double safe stay for vehicle 6 Endure max 5 ton destructive testing, fulfill 4 ton actual working conditions 7 Chain style pulling device, make the security parameter up to 5 times 8 Equipped upper beam, enhance the lifting capacity 9 Equipped emergency limit switch to ensure the lifting height safely. QUALITY 10 Total mold tooling technology, to ensure the conformity of both many a holes and welding places 11 Digital control raw materials processing center ensure the discrepancies at 1% stage & product consistency 12 Optional revolving support leg and connected sleeve supporting; 13 Gum rubber support leg pad, the endurability 3 times higher than the common materials. POWER 14 Double cylinder dynamic hoist drive device, capacity is more than 4 ton 15 Aluminum pump system 16 Mechanical control hydraulic pressure configuration, simple, endurable and reliable.