Item Type: 90mm Guide Wheels_x000D_ Material: ABS, Stainless Steel_x000D_ Product Aperture: Approx. 23mm / 0.9in, Outer Aperture: Approx. 42mm / 1.7in_x000D_ Product Diameter: Approx. 90mm / 3.5in_x000D_ Applicable: Suitable For 23mm and Below The Pipe Detection Camera, For The Pipe Diameter > 90mm Space Use_x000D_ Gross Weight: 108g/3.8oz 1SCOPE OF APPLICATION: Guide wheels are suitable for pipe inspection cameras of 23mm and below, and for use in spaces with pipe diameters >90mm. 2PROVIDES MAXIMUM PROTECTION: 90mm guide wheels provide maximum protection. 5 wheels easily fit through pipes over 90mm. 3PIPE INSPECTION CAMERA ACCESSORIES: Pipe inspection camera guide wheels provide a great accessory for your valuable pipe inspection camera system. 4SAFE AND RELIABLE: Pipe inspection camera guide wheels with pulley structure, play the role of labor saving, safe and reliable. 5ROBUST AND DURABLE: 90mm guide wheels are made of ABS and stainless steel for corrosion and rust prevention and long service life.1 x_x000D_ _x000D_ 90mmGuideWheelsPlease allow some error due to manual measurement.