This hand priming tool not only seats primers quickly, it’s also the safest. A patented safety mechanism separates the seating operation from the primer supply, virtually eliminating the possibility of tray detonation. Fits in your hand for portable primer seating. Primer tray installation requires no contact with the primers. Uses the same shell holders as RCBS presses. Made of durable cast metal. Features large and small primer plugs and sleeves.