C.R. LAURENCE P380HJ CRL Polycarbonate "h" Jamb 180 Degree for 3/8" Glass. This CRL Clear Polycarbonate "H" Jamb is for use on 180 degree inline glass-to-glass applications. Snap onto the fixed panel with the lip on the strike side, or onto the door with the lip on the hinge side. Leaves a clear appearance while serving as a functional seal. Entire "H" Jamb is made of hard polycarbonate.. Part Numbers Variations: P380HJ