hss drill bits ,detail as following:

size:0.1mm till 25mm by 0.1mm step

material: M35,M2,W9,W4,and 4241#,

surface finish:bright,titanium coated,black&bright finish,amber,amber&black,amber&bright.

manufacture process: fully ground,half ground,roll forged,milled

point angle: 135,118,130,multifork,

shank: straight shank,reduce shank,tri-flat shank，

din1897 is the short series of  hss drill bits, and different market likes different

color,about the point angle,multifork point can increase drill's quality too much ,

and tri-flat shank make drills can be gripped more strongly,avoid smooth.