Material: DSR7B,Sus420J2  
Length: 1+mm,tolerance:±0.005mm  
Diameter:0.4-0.6mm, tolerance:±0.001mm  
Roundness: 0.3μm  
Roughness: Ra0.04 
Straightness: 0.0005mm 

Chamfer:R 
Hardness: 700-850HV 
Heat treatment:Point hardening,quenching hardening

All products can be customized according to customer requirements.