Nuts And Bolts Bonanza Set (6Pk) - ECY-26172 offers a thoughtfully designed, durable resource for hands-on learning. A bumper set of nuts and bolts so that you don't need to worry about taking_x000D_ turns or losing a few. A great way to get children practising those fine motor skills._x000D_ Set of 6. Zinc plated. M5 x 12mm. M6 x 12mm. Heads Dia 7cm - 9cm. 5yrs+.