Used for fastening： the insulation between the screw and the heating component metal sheet to prevent transistor short circuit blasting tube.

Usage: used with heat sink gasket.

Typical specifications: to-220, to-220a, to-220b, to-220c, to-220d, to-220e, to-3, etc.

there are more than 300 sets of non-standard specifications, welcome new and old customers to order.