Priming cases with a hand priming tool can save valuable time. The RCBS Hand Priming Tool not only seats primers quickly, a safety mechanism separates the seating operation from the primer supply to reduce the risk of tray detonation. It fits in a reloader's hand for portable primer seating and primer tray installation requires no contact with the primers. The tool uses the same RCBS shell holders (post-1980) as RCBS presses. It's made of durable cast metal and includes large and small primer plugs. The RCBS Hand Priming Tool can hold 100 primers in the primer tray eliminating down time refilling the tool. Notes: RCBS Shellholders are compatible but are NOT INCLUDED, safety glasses (not included) should be worn any time cases are being primed