model_code,size,stroke,rod,sensor,step_file
ULT50040AK0,50,40,A,K,ULT50040AK0.step
ULT50040GK0,50,40,G,K,ULT50040GK0.step
ULT50040GN0,50,40,G,N,ULT50040GN0.step