现货速发2 20UU ba brig ier diater 20x2x42mm guide li

20x2x42 mm linear graphite copper set bearing copper bushin

2pcs LMH20UU 20mm flange linear bearing LMH20 20x2x42 mm

304不锈钢非标超薄垫片小边平垫 M20x25 28 30 35 30x42x2mm厚度