U-Shaped Keep. U-Shaped Cubicle Keep from Asec to be used in conjunction with the Asec Cubicle Indicator bolt on `open out` or flush fitting doors. This keep comes supplied with the necessary fixings and is suitable for use on 13mm or 20mm board.. U-Shaped Keep to suit Asec Cubicle Indicator Bolt. Suitable for use on 13mm or 20mm board. Supplied with wood screws. Reversible