Ruby tipped coil winding nozzle /wire tube guide nozzle for Nittoku winding machine Product Features The product is made of stainless steel and ruby by precise processing and combination. The rigidity of ruby is above than the level 9 and is just less than that of diamond. It is a single crystal and can be made with high brightness and cleanness. It can effectively protect paint film and long-term contiual work to ensure the high insulation of wire coil suffers no hurt.