Product Description KINGROON 3D Printer Smooth Rod Linear Rail 300/320/330/350/390/400/500 mm Optical Axis Diameter 8mm Linear Shaft Rail Guide . Brand Name:KINGROONItem Type:Linear RailModel Number:B0560-30Material:Stainless SteelLength:300mm 320mm 330mm 350mm 390mm 400mm 500mmDiameter:8mmSupport:Wholesale Retail Discount Free Fast Shipping |