The DLS closed end insert is a low profile, splined, bubbling insert in aluminum or steel construction offered in a wide variety of standard and metric thread sizes. Bubbling means that during the installation process, the insert collapses into a bubble shape on the backside of the application material. The application material is clamped between the flange of the insert and the bubble shape resulting in high resistance to pull-out loads.
 
The closed end design ensures a waterproof design.
 
The bubble also serves as a load bearing surface, which absorbs the force of setting the insert. Otherwise the setting force, or clamp load, could spread into the application material and might damage the material. This makes the DLS insert ideal for use in thin sheet, soft, brittle and low strength materials.
The splined body of the DLS insert press into the application material during the installation process. Splined inserts are 50% less likely to turn in the application hole compared to plain body inserts. Splined inserts are ideal for soft materials such as aluminium, magnesium and plastics, where plain body inserts might otherwise fail. The splines also improve electrical continuity in sheet metal applications and electrical assemblies. 

Features
Splined body improves torque-to-turn by up to 50% compared to plain body inserts
Improved electrical continuity in sheet metal fixings
Low profile flange provides near flush installation and clamp up
Reduced tail end diameter offers ease of hole entry
Particularly suited for automation