At 72 years old, my hands can't take the long term use of a manual stapler. With 16 4 x 8 screen panels to replace, I realized I needed something less stressful. I bought an air stapler hoping it would help. Wonderful! This stapler is a little heavier than the handheld staplers I've tried, but the balance and grip make up for it. Very convenient! I started with 60 kilos. pressure and did not get flush penetration. 70 worked well and didn't break through the shield. These Arrow pneumatics saved me a lot of hands and a lot of time. I highly recommend it.