Blind rivets (countersunk head) / NSA / Aluminum body (flange) / Steel mandrel (shaft) / Use when keeping the surface flat. You can tighten multiple base materials from one side with one action. Please use a shrimp rivet to work with shrimp blind rivets. Applications: For aircraft, marine, trains, automobiles and other vehicles. / Farm equipment, furniture, signs and other signs; Sheet metal, construction, sash, interior and more. [Caution/Conditions] The appropriate thickness of the sheet and hole meter should be used with the specified dimensions and take thorough consideration of the safety rate. Please be sure to read the rivet user manual carefully before using. Image Note: The image uses (NSA54K).