Item Type: Length Counter Wheel 1For Measuring: Ensuring stable working on length meter and rolling encoder, the wheel enables easy measurement on speed and position. 2Broad Utility: Allows for application in bracket installation and the the length counting of plate, tube, belt, etc., very practical. 3Reliable Work: Comes with a sturdy structure and 6mm hole diameter, the wheel ensures low noise and smoother rolling for accuracy. 4Good Material: Adopting premium aluminium alloy and silicone material, the length counter wheel accessory is very durable for using. 5Easy to Install: Designed to have a compact size and a light weight, the encoder wheel can be quickly installed in several minutes.1 x Length Counter Wheel 1 x Hex Wrench