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• Free! whatever quantity you purchase all can get 10g grease for rail !!! (Polish warehouse doesn't participate temporarily) *Regarding the size of the rail, there'll be a tolerance of -1-0 mm for the size of the rail*The slider is product of 440C stainless steel, and the handbook rail is product of bearing steel*The default distance between the tail end and the first hole, the two ends are equally divided, that is, the two ends of "E" are equally divided, when you've got requirements, please ask before purchasing. Quantity: 1. 1 set= 1 notebook computer MGN9H/C(block)+1 personal computer instruction manual If you select unmarried 1 MGN9C or 1 MGN9H, the actual quantity may be 1 block (do not encompass the guide). * The instruction manual rail and the slider are Class C, we think it's not necessary to provide additional metal balls, because the precision size of the metal ball won't match the dimensions of the slider steel ball, reminiscent of -2μ -4μ ± 0 +2μ, that might shorten the slip The useful lifetime of the block.* If you wish extra metallic balls, we will give them away for free. Operation method: place an order and go away a message, by means of default, a steel ball with a tolerance of ±0 can be provided. (Polish warehouse would not participate)The slide block preload is ZF (normal clearance)/Z0 (no preload)/Z1 (light preload)The pre-tightening force of ZF-Z0-Z1 increases successively,ZF/Z0 is shipped randomly and the worth is the same.When the slider is vertical,ZF can slide under the gravity of the slider.Z0 can slide beneath thrust.This is only a rough description, now not rigorous, with out pondering factors similar to lubricating oil, it is going to only be used as a reference. (Considering that some buyers use this as a standard for the quality of the slider)We recommend that most 3D printers or gentle desktop instruments use ZF/Z0 preloadZ1 is solely suitable for occasions where accuracy and existence are required.We additionally present nickel-plated rails/chrome-plated rails/blackened rails/44C martensitic stainless steel rails, in addition stainless steel 440C sliders/plated slidersIf you are interested in them, please touch us.  

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