Size and fit Total diameter: 40 mm (1.57 inches) Length: 55 mm (2.17 inches) Bore diameter: 18 mm to 19 mm (0.7 to 0.75 inches) Material and durability Body: aluminum alloy for a sturdy and lightweight frame Ring: polyurethane for efficiency vibration damping and anti abrasion Built to handle torque with reliable bearing support Performance benefits Reduces stress and vibration in the transmission to protect connected components Offsets shaft displacement within the specified bore range for smooth operation Suitable for torque transmission, improving system stability and longevity Applications and compatibility Suitable for servo motors and step motors Ideal for use with 3D printers, DIY encoders, spindles Works with CNC router machines and engraving, drilling, milling systems Practical use scenarios 3D printer upgrade: connect stepper motor to the drive mechanism, mitigating minor misalignment and reducing print artifacts due to vibration CNC router or engraving machine: transmit torque to the spindle while dampening shaft wobble for cleaner cuts and longer tool life DIY encoder or spindle setup: improve measurement accuracy and reduce transmission noise by absorbing vibration and misalignment Why this product stands out Robust aluminum body paired with a damping polyurethane ring delivers reliable performance under demanding loads The design provides effective vibration management without sacrificing torque capacity Clear compatibility with a wide range of motors and machinery keeps integration straightforward