Kartlasers V2 is the evolution of the V1 in terms of how the laser is calibrated and the construction material which is resin as opposed to ABS like in the V1   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 V2 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 v2 please be careful when setting on either the axle or spindle same goes when taking it off. The Kartlasers v2 are made of resin 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 V2 comes with a custom plastic case with padding. Works with 4 AA batteries not included.