The Easton 5mm Match Grade SS #6 HIT Collar 6pk (901533) is designed to improve the impact durability of arrows using the HIT system. Made from hardened stainless steel, these collars are built to withstand the toughest conditions. They come in six sizes to fit all 5mm Easton arrows and are included with Easton Match Grade 5mm arrows. These collars can also be purchased separately for many 5mm arrows on the market. Ideal for archers seeking enhanced arrow performance, these collars fit 5/16 field points and provide superior durability.