Easton Match Grade HIT Collars. Designed from the feedback of Easton’s top shooters and pro shops, Easton’s new Match Grade HIT Collar are designed to increase the impact strength of an arrow using the HIT system. Built out of hardened stainless steel. Come in 6 sizes to accommodate all 5mm Easton Arrows. Included with Easton Match Grade 5mm Arrows. Can be purchased separately for many 5mm arrows on the market.