Andrew- That arrow is a hunter grade shaft sold by Bear Archery up until '87 or thereabouts. The Metric Hunter was made by Easton for Bear and is basically a Gamegetter (before they were XX75). They were offered in four spines: 8.4,8.5, 8.6, and 8.7. All four used the same insert and the wall of the shaft was progressively thicker.These arrows were the less expensive version of the X7 Metric Magnum that was discontinued at the same time. I still use Metric Magnum 8.6s and 8.7s out of three of my bows. The 8.6s are very similar in spine and weight as the old Bear Magnum 320 that Mr. Bear liked so well. GY