the RB2 and RB4 staples are junk. It won't be long and that cable will be all lazy looking and not straight. When i was on the install side, I use screw clips and thats it and I could run circles around anyone who thought the staple gun was faster. Not only are the screw clips cheaper they hold the cable tighter and won't sag over time. I used a 18V dewalt Impact drill with a 1/4" magnetic nut driver on the end and it puts them in quick. the impact drill is more balanced and lighter than a hammer drill also
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