This listing is for 50 individual tubing cutter blades capable of cutting copper, brass, plastic, and aluminum pipes. The blades are approximately 0.74 " outer diameter, 0.185" inner diameter, and 0.12" thickness. This is a common size that fits many US tubing cutter tools. IF YOU ARE NOT SURE IF THESE BLADES WILL FIT YOUR TOOL, THEN PLEASE TAKE A MICROMETER AND MEASURE ONE OF THE BLADES THAT CAME WITH YOUR TOOL AND COMPARE IT AGAINST THE DIMENSIONS ABOVE. The blades were produced and specially heat-treated for extra strength in the USA and are of extremely high quality. I have an excess of roughly 25,000 blades and I am liquidating them to free up space. I also have a listing for 20-blade lots if you don't need 50 blades. If you are interested in buying an even larger quantity, then please contact me with an offer. If you have any other questions regarding this listing then please feel free to contact me. Tubing cutter tools, pipes, construction equipment, industrial, blade, wheel, copper, durable.