Bicycle Sprocket Cover, 42T Bike Chain Guard Ring, Gear Chain Wheel Crankset Protector Cover for Mountain Bike, Cycling Chainring Guard Support Protection Cover Accessories(Black)

I was able to fit this on my son's mongoose Durham but only using 3 of the 4 screws. I have no idea how to measure these vs the hole spacing on the cassette so I ordered what was closest without throwing away a bunch of money. It works great and has survived a few crashes already

I counted the teeth to make sure I was getting the correct one 42t, and that's what this is supposed to be, but the holes do not line up. I was able to bend it to get it screwed on but it's all crooked. i would not recommend this.

I managed to line up 2 of the 8 holes and the screws were so cheap the head stripped out. Might stay on for the next few rides but not worth the money.

Very disappointed. Good material, but the wholes do not align with T42 size at all.

According to the measurements this should have fit. Not even close.

Installed easily and keeps my shoe laces from getting in contact with the chain.