They are also known as the black truss markings. They provide a quick visual for the tape user and speed up the measuring process. Originally, 19.2 inches was used in metric layouts. Dividing 5 into 96 inches (8 feet) gives 19.2 inches, which yields five trusses per sheet. The black arrow in the photo to the right points directly at the black diamond located on 19.2. The red stud markings every 16 inches allow for a standard layout of six studs per 8-foot (96) section.
1 Minors under 18 must be accompanied by an adult at all times in the range and store. 2  You must be 21 years old to shoot a handgun & 18 years old to shoot a long gun without being accompanied by a parent or legal guardian.
See our Minimum Age to Purchase / Possess Firearms policy summary for a comprehensive discussion of this issue. In Massachusetts, generally no one under 18 years of age may purchase a firearm or ammunition, and no one under 21 years of age may purchase a handgun, large capacity weapon or large capacity feeding device. young person 12 to 14 years of age also may possess a firearm if he or she is enrolled in instruction under the state hunter education program and is carrying the firearm in a case, unloaded, to or from that class, or is handling or operating the firearm during that class under the supervision of an instructor.