This diamond file is the size of a cash card (5 x 8 cm) and is ideal for sharpening your pole ends. The pole ends need to be sharpened to prevent the poles from slipping which can lead to driving errors and joint injuries. That is why Nordic Cross Skaters and Rollerski Skaters make sure that their pole tips are alway sharp during training, but especially in competitions. This diamond file for pole ends is a cheap way of extending the life of your pole ends and it is also a lot more fun to exercise with sharp pole tips! It is also useful for smoothening/deburring possible rough pole surfaces. It is delivered in a practical plastic cover so you can carry it with you easily. We also provide you with a little instruction manual on how to sharpen the pole tips correctly. With this Diamond File you can sharpen your pole ends. Instead of buying new poles ends once you are not satisfied with the sharpness of your pole ends anymore you can save your money now.