Hi. Between my property and next doors, I've erected a barrier made of regular flags, The flags stand proud of the soil about 300m, 300mm being below the surface. I'd like to cap the top of the line of flags, so that they tend to remain in line. The flags are 48mm thick. My first thoughts are to use strips of plasitc U-channel. I see PAR Group manufactures a product (code PSUC-50X30-4G). Can anyone please offer any other product or method that I could use to cap these flags, that might be better/cheaper? Thanks. Rich