Arrow 5/16" 215 JT21 Staples are built with the same quality and precision as the T50. These staples utilize a thinner wire in a smaller staple format to deliver great holding. Arrow 5/16" JT21 Staples are exceptionally easy to fire, making JT21 staples a favorite with crafters, DIYers, and those with limited grip strength. Used for general home repairs, crafting, art projects, and upholstery.