The KV2 / KV+ Quick Change Set 8mm helps to switch really easy from winter discs to summer (roller-ski) tips. There is no need of glue - it fixes by pressure. The KV2 / KV+ Quick Change Set 10mm fit on all common 8-8.5mm poles of each brand. There are small discs for hard snow, wide one for soft and new snow and tips for summer included.