Simson Allen keys The Simson Allen key set is a very handy set for bicycle maintenance. Many bolts on a bicycle are Allen bolts and this Simson Allen key set contains the six most common sizes. The various keys are attached to a ring so that the right Allen key can be found quickly. The Allen keys are not only useful for bicycle maintenance but also suitable for mopeds, cars and other jobs. Specifications: Color: black Gender: unisex Material: steel Dimensions: 2-7 mm Contents: 1 Allen key 2 mm 1 Allen key 3 mm 1 Allen key 4 mm 1 Allen key 5 mm 1 Allen key 6 mm 1 Allen key 7 mm