Features: 1) Material: drop-forged carbon steel or Cr-V steel2) Size: from 6mm to 32mm.3) Process: forging and stamping, heat treatment to the whole body4) Surface dealing: polish, mirror polish and so on.5) Quality according to the grade 1 international standard, easy to use, durableusing life6) OEM and customers' requests are welcome. producing area:China payment:T/T supplying capacity:100,000 sets/month