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 Wheels Material: ABS, Stainless Steel Product Aperture: Approx. 23mm / 0.9in, Outer Aperture: Approx. 42mm / 1.7in Product Diameter: Approx. 90mm / 3.5in Applicable: Suitable For 23mm and Below The Pipe Detection Camera, For The Pipe Diameter > 90mm Space Use Gross Weight: 108g/3.8oz. Package List: 1 x 90mm Guide Wheels Note: Please allow some error due to manual measurement.