1)single nail release 2)chamber dispenses nail to head 3)nail is magnetically held in place providing true one-handed operation OPERATION: 1) Drop nails into handle 2) Press Button to release nails 3)Nail away Size: 16oz (828) Packing: 37x33x37 cm G. W. /n. W.: 12/10 kgs Ctn/pcs: 12 pcs