... :drive,bend,head,tail,snub,take up,motorized Advantages 1) We can offer solutions on technology and drawing,feel free to contact us ... (2 years), if there's something wrong with our products, we can exchange new one for free and also pay freight fee ... lock. The shell body is aluminothermic welding fabric. The axle can be unidirectional and two-way out.AdvantageWater proof, Dust proof ...