For those just getting started with trajectory, this kit includes everything needed for small-scale trajectory reconstruction. A set of four, co-aligned large-diameter steel trajectory rods can be used on bullet holes down to .32 caliber. Rods can be connected to each other with included stainless steel connectors. A set of four spacer cones and O-rings keeps the rods centered and held in place in the bullet hole. An included Tripod Mount and Angle Finder allows the investigator to work hands-free and makes documentation easy and accurate.