Diameter: 4 inches (100mm), 5 inches (125mm), 6 inches (150mm), etc., suitable for different power Angle grinder or sander.
Aperture: The center hole is usually 5/8 inch (about 16mm), compatible with most sander spindles.
Thickness: The thickness of the abrasive layer is generally 0.5-1.2mm, and the back pile layer is about 0.8-1.5mm, which balances durability and flexibility.