Clecos are like an extra set of hands - you will use these often Quick and easy to use, these spring-loaded 1/4 in. grip Cleco fasteners are inserted into a drilled hole to temporarily hold panels in place during fit up. Cleco pliers are required for installation. Clecos provide fast and positive positioning! When satisfactory final fit up is achieved, the drilled pilot hole may be either plug welded, riveted or drilled larger to the appropriate size for a finished mounting bolt, Dzus type button or Cam lock fastener. All Pro-werks Clecos are packaged in quantities of 10. Clecos help when mounting Body Panels Lexan Windows Interior Tin Floor Boards Firewall / Dash Wing Skin Locating tabs for welding Compatible materials Steel Aluminum Magnesium Carbon Fiber Fiberglass Lexan The steel body of Pro-werks Clecos are color coated for quick size identification Cleco sizes & colors: 3/32" diameter x 1/4" grip (Silver Color) 1/8" diameter x 1/4" grip (Copper Color) 3/16" diameter x 1/4" grip (Gold Color) Be prepared to fill up your tool box If you need more of this temporary fastening system for large projects, additional Cleco fasteners are available in convenient packs of 10 and extra Cleco pliers may be purchased individually. The Pro-Werks Cleco Fastener Kits are great starter packages, and also make a perfect gift for a friend.