Impact point, for wooden shafts or arrows 5/16. Usually used in small game hunting or to knock down objects.

The SpineApp is a tool to measure shafts spine and weight. It also suggests the correct draw weight for the shaft measured. Really simple to use, quick and practical, it needs to be connected to an android smartphone or tablet equipped with USB with OTG technology. Before starting using the device you need to download the app from the website www.spineapp.it, which you can also access reading the QR code laser carved on the instrument. Another option is downloading the app from Google Play Store.