Specification: Material:Tungsten Steel Shank diameter: 3.175 Mill diameter: 10pcs a set(1.3, 1.4, 1.5, 1.6, 1.8, 2.0, 2.4, 2.5, 3.0, 3.175mm) Features: Universal PCB mill , processing with high efficiency , long service life,suitable for common PCB,can control good edge finishing. High dimensional accuracy , chip,removal performance good , sharp chip,suitable for all kindsof PCB,especially for high TG,environmental protection PCB,and high hardness PCB processing . Range of processing: PCB, SMT, the CNC, mold, plastic, copper, stainless steel and other precision metal parts processing. Package included: 1x Set (10pcs)End Milling Bits 1x Transparent plastic box