This is an AR500 plate, 10mm thick for use on the target hangers. They come with two holes for assembling onto the straps. his plate will work well with standard centrefire rifles from 50 meters and magnums from 200 meters. These plates are not for use with armour piercing or steel cored projectiles. Some impact distortion may occur at the perimeter where the cuts are due to the plasma softening the material for about 1 or 2mm. If you have a bulk order, please call or email for best shipping rates.