... 0~0.03mmDiameter tolerance 0~0.001mmSurface finish Within 0.0001mmDiameter 0.7mm to 80mmLength 2mm to 150mmHardness standard HRC58—65Grade G1,G2,G3,Chamfer0.1 ,0.2,0.3Roundnesswithin 0 ... ToleranceG20-1020/-2,-1/-3,-2/-41h13-3/-5,-4/-6,-5/-7-6/-8,-7/-9,-8/-10G30/-1030/-3,-1.5/-4. ... product,because we have these:8.Certificate For more informations,please contact with me! 2*3.8 mm needle roller using in ...