Arrow ARRJT21C JT21C Staple Gun Tacker - Chrome The Arrow JT21C Staple Gun Tacker comes in a compact lightweight design, perfect for light-duty DIY work with a durable chrome finish & all-steel construction. Features: Contoured handle. Visual refill window. Jamproof mechanism. Built-in staple lifter. Chrome finish. Fires: JT21 Staples: 6-10mm.