Cam fasteners are not alike! This cam lock is designed for removable wood screenstorm sash panels. It is engineered for easy installation. All that is required is a biscuit machine, a 12" forstner bit, and a 12" router bit. A standard screwdriver operates it. None of the hardware protrudes the way a thumb-turn does. The cup that holds the cap screw head has a spiral burr which screws into the wood to insure it will not fall out when the door is slammed. Installation tool available for shop floor productivity. "O" ring provides sealing, and holds the blade in position. The strike plates also reinforces the slits in the wood. Available in satin 304 stainless steel, and also in satin unlacquered brass, or in US-10B dark oxidized oil rubbed bronze.