hss drill bits long series: din340 standard

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，

din340 is the regular standard 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.