Since 1978, Kosta has provided more professional products in science and industry. Our engineers aim to provide more efficient, more durable, and more economical products to the masses. Hope to make Kosta products a part of your life. Carving wheel size：4''× 5/8''（100 × 16mm） Fits standard 4 inch or 4 1/2'' angle grinders, such as Makita, Bosch, Dewalt, Black Decker, Milwaukee, Hitachi, etc. Suggest by code of safe working practices, Before using an angle grinder, Please ensure that: Wear appropriate Personal Protective Equipment. During use Use two hands to operate the grinder. Hold the grinder against the workpiece with minimum pressure, so the disc does not ‘grab' and cause it to kickback Stop at regular intervals for a short break to rest your hands and arms Never put a grinder down until the disc stops rotating Remove the plug from the Power Point before changing discs When not in use, disconnect the power and place the grinder on a bench with the disc facing upwards. Do not use the switch lock function on any grinder.