Gears pack sturdy plastic 28pieces

Gears pack contains 28 gears with 8 different sized gears: 4 x (8 tooth), 4 x (12 tooth x 13.75mm dia), 4 x (15 tooth x 16.75mm dia), 4 x (18 tooth x 19.75mm dia), 4 x (30 tooth x 31.75mm dia), 4 x (38 tooth x 39.75mm dia), 4 x (45 tooth x 46.75mm dia).