A tool assembly comprising: a staple cartridge including: a cartridge body defining a longitudinal axis, a first central knife slot , a plurality of first staple receiving slots , and a plurality of second staple receiving slots , the plurality of first staple receiving slots aligned in rows on a first side of the first central knife slot, the plurality of second staple receiving slots aligned in a row on a second side of the first central knife slot, each of the plurality of second staple receiving slots having a Y-shaped configuration; a plurality of first staples , each first staple of the plurality of first staples received within one of the plurality of first receiving slots; and a plurality of second staples , each second staple of the plurality of second staples received within one of the plurality of second staple receiving slots and having a Y-shaped configuration; and an anvil including an anvil plate defining a longitudinal axis and having a staple forming surface , the staple forming surface defining a second central knife slot , a plurality of first staple forming pockets , and a plurality of second staple forming pockets , the plurality of first staple forming pockets aligned in rows on a first side of the second central knife slot, and the plurality of second staple forming pockets aligned in a row on a second side of the second central knife slot, each second staple forming pocket of the plurality of second staple forming pockets being aligned in a row on a second side of the second central knife slot and having a Y-shape. a staple cartridge including: a cartridge body defining a longitudinal axis, a first central knife slot , a plurality of first staple receiving slots , and a plurality of second staple receiving slots , the plurality of first staple receiving slots aligned in rows on a first side of the first central knife slot, the plurality of second staple receiving slots aligned in a row on a second side of the first central knife slot, each of the plurality of second staple receiving slots having a Y-shaped configuration; a plurality of first staples , each first staple of the plurality of first staples received within one of the plurality of first receiving slots; and a plurality of second staples , each second staple of the plurality of second staples received within one of the plurality of second staple receiving slots and having a Y-shaped configuration; and a cartridge body defining a longitudinal axis, a first central knife slot , a plurality of first staple receiving slots , and a plurality of second staple receiving slots , the plurality of first staple receiving slots aligned in rows on a first side of the first central knife slot, the plurality of second staple receiving slots aligned in a row on a second side of the first central knife slot, each of the plurality of second staple receiving slots having a Y-shaped configuration; a plurality of first staples , each first staple of the plurality of first staples received within one of the plurality of first receiving slots; and a plurality of second staples , each second staple of the plurality of second staples received within one of the plurality of second staple receiving slots and having a Y-shaped configuration; and an anvil including an anvil plate defining a longitudinal axis and having a staple forming surface , the staple forming surface defining a second central knife slot , a plurality of first staple forming pockets , and a plurality of second staple forming pockets , the plurality of first staple forming pockets aligned in rows on a first side of the second central knife slot, and the plurality of second staple forming pockets aligned in a row on a second side of the second central knife slot, each second staple forming pocket of the plurality of second staple forming pockets being aligned in a row on a second side of the second central knife slot and having a Y-shape. <EOS>