Feature:1. SCOPE OF APPLICATION: Guide wheels are suitable for pipe inspection cameras of 23mm and below, and for use in spaces with pipe diameters >90mm.2. PROVIDES MAXIMUM PROTECTION: 90mm guide wheels provide maximum protection. 5 wheels easily fit through pipes over 90mm.3. PIPE INSPECTION CAMERA ACCESSORIES: Pipe inspection camera guide wheels provide a great accessory for your valuable pipe inspection camera system.4. SAFE AND RELIABLE: Pipe inspection camera guide wheels with pulley structure, play the role of labor saving, safe and reliable.5. ROBUST AND DURABLE: 90mm guide wheels are made of ABS and stainless steel for corrosion and rust prevention and long service life.Specification:Item Type: 90mm Guide WheelsMaterial: ABS, Stainless SteelProduct Aperture: Approx. 23mm / 0.9in, Outer Aperture: Approx. 42mm / 1.7inProduct Diameter: Approx. 90mm / 3.5inApplicable: Suitable For 23mm and Below The Pipe Detection Camera, For The Pipe Diameter > 90mm Space UseGross Weight: 108g/3.8oz.Package List:1 x90mm Guide WheelsNote:Please allow some error due to manual measurement.