Accommodates standard stamps with approximately 5/16" square bodies. Eliminates the need to hold ring and stamp in one hand. Simply position ring over mar-proof nylon anvil and tap stamp with mallet. Easy and accurate time saver. eliminates slipping of ring and it's also ideal for flat stamping. The sleeve can be reversed or the stamp body can be touched up with a file if stamp is not 5/16" square. Stamps not included.