[Taper Spindle Adapter Size]: The total length of the threaded taper spindle adapter is 88mm, with a threaded portion of 55mm and an inner hole diameter of 8mm. This taper spindle adapter kit is designed for shafts with a diameter under 8mm. Please verify dimensions before purchase to ensure compatibility. [Installation]: Install the spindle adapter onto the bench grinder and secure it using the two set screws with a small wrench. Align the center hole of the polishing wheel with the shaft tip, then push and rotate the polishing clamp wheel into place. Two adapters are included, allowing installation on both sides of the bench grinder. [Application]: This taper spindle adapter is compatible with mini bench pads and small bench grinders. It can be used with cloth polishing wheels, fiber wheels, and wool wheels. Suitable for 3-inch, 6-inch, and 8-inch polishing wheels. [Bench Grinder Spindle Extension]: Converts your bench grinder into a bench polisher. The adapters are securely held in place with grub screws. [Material]: Made from durable steel for long-lasting performance. Includes left and right adapters. [Size]: Refer to the provided size image for accurate measurements.