This tacker works with 18 gauge, 5.7mm (1/4") narrow crown staples (similar to type 90, No.90 Narrow Crown) and 18 gauge 2mm (1/16") crown brad nails (comparable to Tacwise 18G, Arrow BN18, Bostitch 18G & Rapid no. 8 brad nails) in the following sizes: Staples – 15mm (9/16"), 16mm (5/8"), 18mm (5/7"), 19mm (3/4"), 21mm (13/16"), 22mm (7/8"), 25mm (1") Nails – 15mm (9/16"), 16mm (5/8"), 21mm (13/6"), 25mm (1"), 30mm (1-3/16"), 32mm (1-1/4").