These needles come in different shapes and sizes according to their intended purpose. Surtex Instruments manufactures a premium range of Redon Guide Needles. All guide needles are manufactured in stainless steel made and equipped with either knife or lancet tips which are available in different sizes ranging from 2.7mm to 6mm. Different blade angles are also available. The Surtex Instruments Redon Guide Needle with a knife tip is commonly used for wound drainage after hernia procedures.