Front End Laser Alignment for Camber and Toe on Karts with magnetic and tie rap attachments The level on the top makes sure that the lasers are level before making any adjustments. Kartlasers V1 fits on 17mm or 25mm stub axles or 40mm hubs. Once the lasers have been positioned, each of them will beam the precise position of the spindle on the graduated grid of the other, with the classic laser “dot”. Disclaimer: When using the kartlasers v1 please be careful when setting on either the axle or spindle same goes when taking it off. The Kartlasers v1are made of abs not metal. We are not responsible for any damage to the kartlasers while using . Free shipping insurance only covers the first 100$ if you wish to purchase additional coverage please follow this link https://dmjracing.com/product/shipping-insurance/ Kartlasers V1 comes with a custom plastic case with padding which has small imperfections in the plastic which I why this is on special. Works with 4 AA batteries not included.