drill bit size: 4-12mm, 4-20mm, 4-30mm
or if you need other drill set,just let me know
drill bit package:plastic box
drill bit surface: titanium coated,bright ,nitrogenize
drill bit material: hss4241,hss4341,hssm2,hssco
step drill bits
Jiangsu Feida Tools Co.,ltd Houxiang Town Danyang City Jiangsu Pronvice China whatsapp/wechat:+86 15952951787 email:feidachina@hotmail.com
web: www.feidatools.net