Bought these to finish the 3/8 inch rubber line. Straight back clamps are not suitable for this purpose (need round back clamps), pliers are cheaply made. The clamp groove is inaccurate, so the clamp cannot be installed directly in the pliers, causing difficulties in use. The pliers are barely enough to hold the included 3/4" clamps, further complicating the "squaring" problem. Bottom line: I made a bad decision and basically threw $15 in the trash with this purchase. I hope others don't make the same mistake.