4-piece hollow-end stainless steel roll pin starter set. Holds roll pins so you can align them with their holes and then tap them to get started. Prevents slipping and damage to your gun's finish. Complete installation of the pins with a regular punch. Great for AR upper receivers. Compact 2.75 inch length with knurls for a good grip. Use with pins up to 1/8. Save yourself a big headache with these great tools.