door part Parameters: 1.there are five parameters:extented length,sroke length,rod diameter,body diameter,force. 2.the parameters can be decided by buyers. Stroke length(mm) Extented length(studs) (mm) Rod diameter (mm) Body diameter (mm) Force range (N) 60 195 6 15 25N-400N 64 194 6 15 25N-400N 90 230 6 15 25N-400N 90 245 6 15 25N-400N 150 365 6 15 25N-400N Packing and Delivery: packing details: 1.1 pc/a plastic bag. 2.the product number and the QTY printed on the carton. 3.as your request. delivery details: it's up to your quantity. Certification: GB/T19001-2000-ISO9001:2000 standard. Item Gurantee Life: Through more than 50,000 times recitprocating fatigue test. warranty: one year. Product Features: long lifespan,superior design ,reasonable price,fast delivery,excellent paint surface,high quality. caution: Don't open,high compressure.