A Black Rubber Bumper Plate 5Kg serves several functions when it comes to weight lifting and bodybuilding. You can use Black Rubber Bumper Plate 5Kg by itself to perform a variety of exercises including sit-ups, bent-over rows, squats, lunges and overhead lifts. -Sold Stainless Steel Insert Diameter 2* -Bumper Diameter 17.7''/450mm (IWF Standard) -Smooth Finish -Dead Bounce