Good quality cheap efficient Type 49U UM - 1 UM-5 other UMAngle tolerance + 7.5 "+ 15" + 30"Φ8.5,Φ8.0 Φ5.5 Φ4.5 Φ4.0-Φ30Thickness 0.08-0.50 mmFrequency 4M - 40MSurface finish 3000 #, 4,000 #, corrosion, polishing Thus, if you are interested in this, just send me the specification of the products you need, or the draft, and then we will give you the best quotation.