Arrow JT21CM features an all chromed steel housing, jam resistant mechanism, proven rear load magazine and steel working parts hardened in a 1,500 degree furnace. A rugged coil spring gives this tool the power and performance one would expect from a much larger stapler in a smaller fine wire format. And a convenient staple viewing window indicates when staples are running low. Built-in staple lifterAll-chrome finishJam-resistant mechanismVersatile staple gun home, office or workshopVisual refill windowJam-proof mechanismBuilt in staple lifterUses 3 sizes of JT21 staples 1/4 in. - 3/8 in.Handy for repairing screens, light upholstery, etc.