Blade shapes 6 - 16 plus the double edged 40 blade used within Histology and the SG3 Minor Skin Graft blade for the Burns unit all compatible with the associated No.3 fitment handles. All the popular sizes are available in both a Carbon or Stainless steel sterile pack of 100 blades. Blade shapes 18 -36 used for major invasive procedures and compatible with the associated range of No.4 fitment handles. All the popular sizes are available in both a Carbon or Stainless steel sterile pack of 100 blades.