Description: * Brand new and high quality. * Made of high quality material, durable and practical to use. The following parts are included for each rotor blade: Composite Blade Material - The blades are made of proven industrial material used in mining equipment. The outer layers are highly resistant to wear, while the inner core provides strength without becoming brittle. Size - 4 inches long, 1/4 inch thick, 1-7/8 inches wide. This is stiff enough for almost any machine. If you prefer a thicker/stiffer blade look for our heavy rigs. Mounting slots - this was the first set to introduce paddle slots. The slots provide flexibility in tuning the installation and allow the blades to move if they ever wear. Four sockets provide greater installation flexibility. If the strip or rib is in the way, you can skip the hole and still have 3. If you want to trim the shoulder, you have more options. Clamping plate Material BAR-stainless steel for durability. Holes - The holes are sized to precisely guide drilling and associate with the blades. These are purpose specific parts, no extra holes required. They support the entire length of the blade. Production blades are manufactured using digitally controlled machines that ensure consistent parts. This means they will not cause rotor imbalance. Hardware Material - Stainless steel for durability and serviceability Nuts - Locking nuts so you don't have to over-tighten them Screws - Hex bolt so you can use wrenches, sockets or nuts in tight spaces. The screws are 1 inch long to accommodate the stamped rotor fins.