How to use: First, make sure you have a Cordless Concrete Nailer (CCN) or Trak - It C5 tool. These washers are for light - duty applications on concrete. Insert the pins as required and place the washers in the right position. Note: Only use these washers on concrete as other materials may not support the allowable load of 50 lbs. Also, ensure the pin embedment is at least 5/8 inch. Maintenance: Keep the washers in a dry place to prevent rusting. Check them regularly for any signs of damage, and if you notice any, replace them immediately.