Circuit Board Shielding (CBS) Shields LeaderTech Circuit Board Shielding (CBS) Shields offer a 0.13' to 4' height range and a two-piece design that accommodates virtually any through-hole or surface mount application. The two-piece design is highly reliable and includes a solderable fence and removable cover. LeaderTech CBS Shields provide sensitive component protection while allowing access for adjustments and repairs when needed.