|  | 
                                         | 
                                       
                                        |  |  
                                        Easy to handle and 
                                        install | 
                                    
                                    
                                       
                                        |  | 
                                         | 
                                       
                                        |  |  
                                        Radial slots provide greater collapse 
                                        strength due to the arch effect of 
                                        material around each slot. | 
                                    
                                    
                                       
                                        |  | 
                                         | 
                                       
                                        |  |  
                                        The joints have good tensile strength 
                                        and can hold the weight of the suspended 
                                        assembly. | 
                                    
                                    
                                       
                                        |  | 
                                         | 
                                       
                                        |  |  
                                        Threaded joints of casing pipes provide 
                                        quick assembly |