Product Description: Advantages: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Made of high-quality bearing steel, guarantee its long service life4. MGN12H,45mm Length, 27mm Width, 10mm thickness,M3x3.5 fixing Screws hole5. Applications for semiconductor manufacturing equipment, printed circuit board IC assembly equipment, medical equipment, the machine arm, precision measurement machines, office automation equipment, other small linear sliding device.6.Attentions: : When the linear guide slider slides on the track, the surface of the track should be wiped clean first. If there is iron sheet on the guide rail, the sliding block will produce noise and it is easy to wear the internal steel balls.7.Slowly slide in after aligning the reference surface of the guide rail. Attentions: 1.Fixing screws is not included in the package.2.There is a fake Linear Sliding Guide to fix the slide balls, to prevent ball drop on the way of shipping. Please replace the fake Linear Sliding Guide Rail with real Linear Sliding Guide Rail when using it.3.The real Linear Sliding Guide Rail is not included in the package,please order it separately.specification:Color:Black,Silver,Green,RedMaterial: bearing steelSlider length: approx. 45mmSlider width: approx. 27mmSlider thickness: approx. 10mmFixing screw size: M3x3.5Sliding Block Size: approx. 45 x 27 x 10mm/1.77 x 1.06 x 0.39 inch(L x W x T)Total Size: approx. 56 x 27 x 13mm/2.20 x 1.06 x 0.51 inch(L x W x T)Weight: 57g Package include:1 x MGN12H Extension Guide Rail Sliding Block1 x Fake Linear Sliding Guide Rail