1. Similarities
A. All of them are multi-fit wiper blades with 12 adaptors. Fit for 99.9% European, American, Asian vehicles wiper arms.
B. 12 adaptors/ clips & some arms.
C. 12 adaptors/ clips fit for European, American & Asian vehicles.
2. Differences
A. They have different structure spring steel. BY610, BY611 & BY630 have same double spring steel, but BY660 with single spring steel, which is better performance for balance strength.
B. Their zinc-alloy connectors are also different. Just like the picture.
C. Their adapter protection is also different. BY611 is all zinc-alloy material. BY610, BY630 & BY660 with a soft TPR plastic to hold zinc-alloy adapter, and also protect windscreen, avoiding from scraping the window glass when wiper works.
D. Their rubber refills are in different style & structure. BY610, BY611 & BY630 are using the same ZR 6mm rubber refill, but BY660 is using NR 6mm rubber refill.
ZR 6mm NR 6mm
E. BY610 uses PVC spoiler with 2 POM borders, but BY611, BY630, & BY660 all use TPR spoiler.
BY610 PVC spoiler
BY611, BY630 & BY660 TPR spoiler
F. BY610, BY611 & BY630 without several clips to fix the rubber refill, but BY660 with some clips to fix the rubber refill.
G. Now, we attach all of pictures for BY610, BY611, BY630 & BY660. Hope you can understand better.
3. Advantages
A. All of them are multifit type, 12 clips, suitable for European, American & Asian vehicles.
B. All of them with Zinc-alloy inside connector which is more durable than Metal and never rusty.
C. BY610 with nice price.
D. BY611, BY630 & BY660 with TPR spoiler, which is soft & durable.
E. BY610, BY630 & BY660 with soft plastic protect windscreen, see 2. Difference C
F. BY660 with several stable clips between rubber and spoiler, which is more stable and even performance.
G. The price from low to high is BY610, BY611, BY630, BY660.
