... (precision type,double guide rail)Size(M)Max. Stretching Are(M)Min. Stretching area(M)Stretching Force(N)Weight(kg) 1.1*1 ... strength,double guide rail )Size(M)Max. Stretching Are(M)Min. Stretching area(M)Stretching Force(N)Weight(kg) 1.1*1.1 ... strength,double guide rail )Size(M) Max. Stretching Are(M) Min. Stretching area(M) Stretching Force(N) Working Power(KW)Weight(kg) 2 ...