Glazing beads are narrow profiles made from timber, PVC, or aluminium that are clipped or screwed into the frame rebate after the glazing is placed. They hold the pane in position and close off the rebate space on the interior or exterior side. The bead geometry must match the rebate depth and glass thickness. Interior glazing beads improve burglar resistance because the glazing cannot be lifted out from outside. Exterior beads allow easier glass replacement but offer less security. Sealing gaskets between bead and glass prevent rattling and protect against moisture ingress. In timber windows, beads often feature a drip rebate profile to prevent water ingress along the joint.